What is the magnitude of the force needed to keep a 60.-newton rubber block moving across level, dry asphalt in a straight line at a constant speed of 2.0 meters per second?
Answers
The magnitude of the force needed to keep the block moving at a constant speed is 60 N.
his is the same as the weight of the block. This is because the only force acting on the block is gravity. As the block is moving at a constant speed, the force of friction is equal to the force of gravity. This means that the magnitude of the force needed to keep the block moving is equal to the weight of the block, which is 60 N. To calculate this, we used the equation F = ma, where F is the force, m is the mass of the block, and a is the acceleration, which is 0 in this case. This gave us the equation F = m x 0, which is simplified to F = 0, meaning the magnitude of the force needed is 0, which is equal to the weight of the block, which is 60 N.
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Related Questions
An 8-N force is applied to a 2-kg box to accelerate it to the right across a table. The box
encounters a force of friction of 5 N. What is the acceleration of the object?
(1 Point)
4 m/s2
2.5 m/s2
1.5 m/s2
1 m/s2
Answers
Answer:
1.5
Explanation:
resultant force=8-5=3N
using f=ma
a=f/m
=3/2
=1.5
a negative charge, -q, has a mass, m, and an initial velocity, v, but is infinitely far away from a fixed large positive charge of q and radius r such that if the negative charge continued at constant velocity it would miss the center of the fixed charge by a perpendicular amount b. but because of the coulomb attraction between the two charges the incoming negative charge is deviated from its straight line course and attracted to the fixed charge and approaches it. find the closest distance the negative charge gets to the positive one
Answers
Answer:
The closest distance the negative charge gets to the positive charge is given by the expression:
r = (k * q^2) / (m * v^2)
Explanation:
To find the closest distance the negative charge gets to the positive charge, we can analyze the motion of the negative charge under the influence of Coulomb's attraction.
Given that the negative charge is initially moving with a constant velocity and would miss the center of the fixed positive charge by a perpendicular distance of b, we can consider the perpendicular distance b as the impact parameter.
The motion of the negative charge can be treated as a projectile motion with the Coulomb force acting as a centripetal force. As the negative charge approaches the positive charge, the Coulomb force causes it to deviate from its straight-line path and approach the positive charge.
The closest distance the negative charge gets to the positive charge occurs when the centripetal force due to Coulomb's attraction is equal to the gravitational force acting on the negative charge.
Using the equation for Coulomb's force, we have:
k * (q^2) / r^2 = m * (v^2) / r
Simplifying and rearranging the equation, we get:
r = (k * q^2) / (m * v^2)
Note that this expression assumes the motion occurs in a straight line and the interaction is purely Coulombic. In reality, the motion of the negative charge may be more complex due to other forces and factors.
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Two skaters stand facing each other. One skater’s mass is 60 kg, and the other’s mass is 72 kg. If the skaters push away from each other without spinning and the 60 kg skater speed it 5.0 m/s the 72kg skaters speed will be what?
Answers
The final velocity of the 72 kg skater is -4.17 m/s. The negative sign indicates that the skater is moving in the opposite direction to the 60 kg skater, as expected.
m1 * v1_final + m2 * v2_final = 0
60 kg * 5.0 m/s + 72 kg * v2_final = 0
Solving for v2_final, we get:
v2_final = -(60 kg * 5.0 m/s) / 72 kg = -4.17 m/s
Mass is a fundamental concept in physics that refers to the amount of matter in an object. It is a scalar quantity that has a magnitude but no direction. Mass is typically measured in units of kilograms (kg) in the International System of Units (SI).
Mass is a property of an object that resists any change in its motion, whether it is at rest or in motion. This is described by Newton's Second Law of Motion, which states that the force applied to an object is proportional to its mass and its acceleration. This relationship is often expressed as F=ma, where F is the force applied, m is the mass of the object, and a is its acceleration.
Mass is also related to energy through the famous equation E=mc², where E is the energy of an object, m is its mass, and c is the speed of light in a vacuum.
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what type of stars can collapse in a supernova explosion and become neutron stars
Answers
Answer:
red supergiants can
An infrared beam of light as a wavelength of 7.7 mm What is this energy
Answers
Answer:
E=2.58155844×10^-29
Explanation:
we use this formula
E= hc/ lambda
E= [(6.626×10^-34)( 3×10^8)]/(7.7×10^-3)
E=2.58155844×10^-29
Please help as fast you can
Answers
Answer:
d a
Explanation:
14. A 75 kg BASEBALL PLAYER RUNS AT A VELOCITY OF 10 m/s TO GET TO SECOND BASE. IN
ORDER TO GET TO THIRD BASE QUICKLY SHE INCREASES HER SPEED TO 12 m/s.
DETERMINE THE WORK DONE BY THE BASEBALL PLAYER.
A. 1650 J
B. 1550 J
C. -1650 J
D. -1550 J
Answers
Answer:
-1650 J
Explanation:
When an object moves at a certain velocity v0 and changes it to v1, a change in its kinetic energy is achieved.
A 15 n net force is used to move a 5kg box. What is the resulting acceleration?
A. 15m/s^2
B. 5m/s^2
C. 20m/s^2
D. 3m/s^2
Answers
Answer:3 m/s
Explanation:
The resulting acceleration to move the 5Kg box is equal to 3m/s². Therefore, option (D) s correct.
What is acceleration?Acceleration can be defined as the rate of change in the velocity of an object with respect to time. The acceleration of an object is a vector parameter with both magnitude and direction. Acceleration is also defined as the first derivative of the velocity w.r.t. time and the second derivative of position w.r.t. time and
According to Newton's 2nd law of motion, the force is equal to the product of the mass (m) and acceleration.
F = ma
And, a = F/m
Therefore, the acceleration (a) inversely proportional to the mass (m).
Given, the force used to move the box, F = 15 N
The mass of the given Box, m = 5 Kg
The resulting acceleration, a = 15/5 = 3 m/s²
Therefore, the acceleration of the box is equal to 3 m/s² when it is pushed with a force of 15 N.
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someone help me please
Answers
Answer:
2g
Explanation:
Mass is force/area
16 N is the force because N is newtons and that measures force
8m/s^2 is the acceleration
They gave it to you right in front of you
how does the linear speed of a child sitting near the center of a rotating merry-go-round compare with that of a dog sitting near the edge of the same merry-go-round?
Answers
The linear speed of a child sitting near the center of a rotating merry-go-round is less than the linear speed of a dog sitting near the edge of the same merry-go-round.
Speed is a fundamental concept that refers to how fast an object is moving. It is defined as the distance covered by an object in a given amount of time. The concept of speed is important in many areas of physics, including kinematics, dynamics, and thermodynamics. It is often used to describe the motion of objects, such as cars, airplanes, and particles.
In physics, there are two types of speed: scalar speed and vector speed. Scalar speed is the magnitude of the velocity vector and is measured in units of distance per unit of time. Vector speed, on the other hand, is the speed of an object in a specific direction and is measured in units of distance per unit of time in that direction.
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A tennis ball is thrown straight up at 45 m/s. Calculate and compare the
displacement at 5 seconds and 6 seconds after its been thrown. *
Answers
Answer:
The answer to your question is given below.
Explanation:
The following data were obtained from the question:
Velocity (v) = 45 m/s
Time 5 (t₅) = 5 s
Time 6 (t₆) = 6 s
Displacement at 5 s (d₅) =.?
Displacement at 6 s (d₆) =.?
1. Determination of the displacement after 5 s.
Velocity (v) = 45 m/s
Time 5 (t₅) = 5 s
Displacement at 5 s (d₆) =.?
Velocity = Displacement /Time
v = d₅ /t₅
45 = d₅ / 5
Cross multiply
d₅ = 45 × 5
d₅ = 225 m
2. Determination of the displacement after 6 s.
Velocity (v) = 45 m/s
Time 6 (t₆) = 6 s
Displacement at 6 s (d₆) =.?
Velocity = Displacement /Time
v = d₆ /t₆
45 = d₆ / 6
Cross multiply
d₆ = 45 × 6
d₆ = 270 m
Summary:
Time >>>>>> Displacement
5 >>>>>>>>> 225 m
6 >>>>>>>>> 270 m
From the calculations made above the displacement of the ball after 6 seconds is greater than the displacement after 5 seconds.
Which data directive creates a 32-bit signed integer variable?
Answers
In most programming languages, including C and C++, the data directive used to create a 32-bit signed integer variable is "int".
For example, the following code snippet creates a variable called "myInt" of type "int" and initializes it with the value 42:
arduino
Copy code
int myInt = 42;
In C and C++, "int" typically refers to a signed integer that occupies 32 bits of memory, although this may vary depending on the platform and compiler being used.
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Use the concept of inertia to explain why Newton’s first law of motion is accepted as true
Answers
What’s the answer please?
Answers
Answer:
C
Explanation:
Hope this helps!
how much work is done when a 100 lb rock is lifted to a height of 3 ft?
Answers
Work done when a 100 lb rock is lifted to height of 3 ft is 9652.215 ft-lb.
What is meant by work done?The work done on an object is equal to the force applied to it multiplied by the distance over which the force is applied. In this case, the force applied is the weight of the rock, which is equal to the force of gravity acting on it.
The weight of an object is given by the formula:
W = mg
Where m is the mass of the object (in this case, 100 lb) and g is the acceleration due to gravity (approximately 9.8 m/s^2 or 32.17405 ft/s^2).
So the weight of the rock is:
W = (100 lb)(32.17405 ft/s^2) = 3,217.405 ft-lb
The work done on the rock is equal to the force applied (its weight) multiplied by the distance it is lifted (3 ft), so the work done is:
Work = (3,217.405 ft-lb) x (3 ft) = 9652.215 ft-lb
Therefore, the work done when a 100 lb rock is lifted to a height of 3 ft is 9652.215 ft-lb.
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The car maintained distance x
Answers
Answer:
7th grade in a year and I am not going for the same as a student from a school year or so cute cat that I don't have a lot to get for it is the greatest thing I can think they are you at the end a bit too far from your home or the other one that is the only thing that is a bit more expensive and
An electron moves in an electric field. Does it move toward regions of higher potential or lower potential? explain.
Answers
The electric fields is always directed from higher potential to the lower potential.
An electron moves in an electric field. Does it move toward regions of higher potential or lower potential?
The electric fields always aiming from the region of higher potential to the region of lower potential. So the force of electrostatic and the direction of the travel of electrons will be always from lower potential to the region of higher potential.
An electric field is defined as the physical field which covers the electrically charged particles and also they can apply force on all other charged particles.
So we can conclude that the electric fields is always directed from higher potential to the lower potential.
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What does it mean if an object is electrically uncharged?
The object has been placed in water.
It has gained positive charges.
It has gained negative charges.
There has been no transfer of charge.
Answers
David drove the first 6 hours of his journey at 65 km / hour and the last 3 hours of his journey at 80 km / hour . How far is the whole journey in km ?
Answers
Answer:
630 km.
Explanation:
To obtain the total distance travelled by David, we shall calculate the distance travelled in each, then sum them together.
Case 1:
Speed 1 (S₁) = 65 km / hour
Time 1 (t₁) = 6 hours
Distance 1 (d₁) =?
Speed = Distance /time
S₁ = d₁ / t₁
65 = d₁ / 6
Cross multiply
d₁ = 65 × 6
d₁ = 390 Km
Case 2:
Speed 2 (S₂) = 80 km / hour
Time 2 (t₂ ) = 3 hours
Distance 2 (d₂) =?
Speed = Distance /time
S₂ = d₂ / t₂
80 = d₂ / 3
Cross multiply
d₂ = 80 × 3
d₂ = 240 Km
Finally, we obtained the total distance travelled by David as follow
Distance 1 (d₁) = 390 Km
Distance 2 (d₂) = 240 Km
Total Distance travelled (dₜ) =?
Total distance = distance 1 + distance 2
dₜ = d₁ + d₂
dₜ = 390 + 240
dₜ = 630 km
Therefore, the total distance travelled by David is 630 km
Which direction will thermal energy flow if you pick up a snowball with your bare hand? Thermal energy will flow from the snowball to your hand. Thermal energy will flow from your hand to the snowball. Thermal energy will not flow between your hand and the snowball.
Answers
Answer:
b. Thermal energy will flow from your hand to the snowball.
Explanation:
Answer:
B
Explanation:
Explain how a helicopter lifts itself up, from a Newton's 3rd Law perspective,
Answers
an electric lamp is marked 240 volt 60 watt what is the resistor when it is operated at the correct voltage.b A. 1/960. B. 1/4 C. 4. D. 960. E. 14.400
Answers
The resistor of the electric lamp is marked at 240 volts and 60 watts is 960 ohms. Thus, option D is correct.
The resistance is a property that gives obstruction the current flow. It blocks the current flow in the circuit. The unit of resistance is the ohm.
From the given,
The voltage of the electric lamp (E) = 240 volt
Power in the circuit (P) = 60 watt
Resistance =?
Power (P) = E² / R
R = E²/P
= 240×240/60
= 960 Ω
The resistance of the electric lamp with a given voltage and power is 960 Ω. Thus, the ideal solution is D.
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A 264 kg boulder is pulled with a rope across a field by a strong man. If the man uses a force of 2,452 N to cause the boulder to accelerate across the field. The coefficient of friction is 0.53. How fast does the strong man accelerate the boulder?
Answers
The strong man accelerates the boulder of mass 264 kg at 4.1 m / s² if he uses a force of 2452 N.
W = m g
W = Weight
m = Mass
g = Acceleration due to gravity
m = 264 kg
g = 9.8 m / s²
W = 264 * 9.8
W = 2587.2 N
F = 2452 N
W = Normal force, N = 2587.2 N
\(f_{k}\) = μ N
\(f_{k}\) = Kinetic frictional force
μ = Co-efficient of kinetic friction = 0.53
\(f_{k}\) = 0.53 * 2587.2
\(f_{k}\) = 1371.22 N
∑ \(F_{x}\) = m a
F - \(f_{k}\) = m a
2452 - 1371.22 = 264 * a
a = 1080.78 / 264
a = 4.1 m / s²
Therefore, the strong man accelerates the boulder at 4.1 m / s²
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.What is the unit of measurement used for Electric Potential?
a. J
b. N
c. V/m
d. N/C
e. V
f. J/C
Answers
The unit of measurement used for Electric Potential is Volt (V). Therefore, option e, V, is the correct answer.
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on the harpsichord, tones are produced by strings stretched over the
Answers
On the harpsichord, tones are produced by strings stretched over the soundboard.
The soundboard amplifies the vibrations produced by the strings and projects them outwards. The harpsichord is a keyboard instrument that dates back to the Renaissance and Baroque eras. It was widely used during the 17th and 18th centuries, but gradually fell out of use in the 19th century as the piano became more popular.
Unlike the piano, where hammers strike the strings to produce sound, the harpsichord plucks the strings with quills. When a key is pressed, a mechanism called a jack lifts the quill and plucks the string, producing a sound. The pitch of the sound is determined by the length, thickness, and tension of the string.
The harpsichord has a distinctive sound that is characterized by its bright, clear tone. It is often used in Baroque music, particularly in compositions by composers such as J.S. Bach, Handel, and Scarlatti. The harpsichord has a complex mechanism that requires a skilled technician to maintain and repair.
Overall, the harpsichord is an important instrument in the history of music. It played a significant role in the development of Western classical music and continues to be used today in performances of early music.
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In an experiment, a thin sheet of material A,B, or C was used to divide two objects of different temperature in each trial, the conditions were identical except for the material of the thin sheet. The data table shows
the times in which the objects reached thermal equilibrium
Which material, if any, is the best thermal equilibrium
Answers
The best material for achieving thermal equilibrium can be determined by analyzing the data table. The time taken for each object to reach thermal equilibrium is dependent on the material used to divide them.
Material C appears to be the best as it takes the least amount of time for the objects to reach thermal equilibrium.
Based on the given information, the material that results in the shortest time to reach thermal equilibrium would be considered the best thermal conductor. To determine this, compare the times in the data table for materials A, B, and C. The material with the shortest time to reach thermal equilibrium is the best thermal conductor and, therefore, the best material for this experiment.
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A boy weighing 50 kg is running at 2m/s. What is its kinetic energy? *
10 points
Answers
The formula is KE = 1/2mv^2
Then you plug in 50 to the m
And 2 to the v . That’s how I got 100 .
Hope this helps
A wave has a period of 4 seconds. Find it’s frequency.
Answers
Answer:
4 x the frequncy
Explanation:
So 4 x the number
In the illustration, the block on the table is at rest. Then, unbalanced forces act on the block. What is the result? Question 3 options: The block moves upward The block moves to the left The block moves to the right The block remains at rest.
Answers
The block on the table will move towards the right when the given unbalanced force act on the object. Option C is correct.
Unbalanced Force:When the force acting on the object is not equalized by the opposite force.
Net force:It is defined as the vector sum of all forces acting on the object at an instance.
\(F = \vec F_1+\vec F_2+.....\)
Where,
\(F\) - net force
\(\vec F_1\) - Force acting on the right = 10 N
\(\vec F_2\) - Force acting towards left = -8 N
Put the values in the formula,
\(F = 10 +(-8)\\\\F = 2\)
Since the net force is positive it means the move towards the right.
Therefore, the block on the table will move towards the right when the given unbalanced force act on the object.
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A ray of light strikes a plane mirror at an angle of incidence of 60°, is reflected from the mirror and then strikes a second plane mirror placed so that the angle beftween the mirrors is 45°. The angle of reflection at the second mirror, in degrees, is
A 15
B 25
C 45
D 65
E 75
plz help me guys ASAP!
Answers
Answer:
60 - 45 = A. 15
Explanation:
Subtracted because the plane mirror at an angle is incidence of 60°, so then in order to find the value it would be 60-45 and not adding it or dividing and multiplying to find the value thus the answer is 15.
60 - 45 = A. 15. Subtracted because the plane mirror at an angle is incidence of 60°, so then in order to find the value it would be 60-45 and not adding it or dividing and multiplying to find the value thus the answer is 15.
What is Plane mirror?A flat or highly polished surface called a plane mirror reflects light or waves to create an image. It is a polished, smooth surface that creates a virtual representation of the actual object.
A plane mirror is a surface on which an image can only be produced by at least two light beams. The intersection of these two beams can occur inside the mirror or appear to occur somewhere behind the mirror.
The image that follows illustrates how an object appears when viewed via a plane mirror.
Therefore, 60 - 45 = A. 15. Subtracted because the plane mirror at an angle is incidence of 60°, so then in order to find the value it would be 60-45 and not adding it or dividing and multiplying to find the value thus the answer is 15.
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