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Mechanics | Relativity
A 34kg crate is is pushed with a horizontal force of 70N at a steady pace. Determine the value of the kinetic friction and the coefficient of kinetic friction.
Mechanics | Relativity
A bird alights on a stretched telegraph wire. Does this change the tension in the wire? If so, by an amount less than, equal to, or greater than the weight of the bird?
Mechanics | Relativity
A car towing a trailer accelerates up a hill. Explain about the forces between the car and a trailer.
Mechanics | Relativity
A car towing a trailer accelerates up a hill. Which one of the following statements is true ?
1. The car exerts a smaller force on the trailer than the trailer exerts on the car
2. The car exerts the same force on the trailer as the trailer exerts on the car
3.The car exerts a greater force on the trailer than the trailer exerts on the car
4. The relationship between the force exerted by the car on the trailer and the force exerted by the trailer on the car depends on the acceleration of the trailer.
1. The car exerts a smaller force on the trailer than the trailer exerts on the car
2. The car exerts the same force on the trailer as the trailer exerts on the car
3.The car exerts a greater force on the trailer than the trailer exerts on the car
4. The relationship between the force exerted by the car on the trailer and the force exerted by the trailer on the car depends on the acceleration of the trailer.
Mechanics | Relativity
In a particular crash test, a car of mass 1 500 kg collides with
a wall, as shown in Figure 9.6. The initial and final velocities
of the car are and , respectively.
If the collision lasts for 0.150 s, find the impulse
caused by the collision and the average force exerted on
the car..
a wall, as shown in Figure 9.6. The initial and final velocities
of the car are and , respectively.
If the collision lasts for 0.150 s, find the impulse
caused by the collision and the average force exerted on
the car..
Mechanics | Relativity
Force acting on a particle moving in a straight line varies with the velocity of the particle as F=k/v,where K is a constant.The work done by this force in time t is:
(A)K/v^2.t
(B)2Kt
(C)Kt
(D)2Kt/v^2
(A)K/v^2.t
(B)2Kt
(C)Kt
(D)2Kt/v^2
Mechanics | Relativity
A submarine is totally submerged and moving upward. Its density is 700Kg/m^3. It was at rest 150 meters below the sea level. Find pressure on it after 3 seconds. (density of sea water is 1025 Kg/m^3).
Mechanics | Relativity
A ball is thrown straight up into the air with an initial velocity of 142 feet per second and an initial height of 2 feet. What is the velocity of the ball after 4 second(s)?
Mechanics | Relativity
Rory, Aurora and Raoul are three lions fighting over a piece of meat of mass 12
kg. Each lion exerts a horizontal pull. Rory pulls with a force of 800 N. Aurora,
who is 120 degrees to Rory’s right, exerts a force of 400 N. Raoul is 140 degrees to Rory’s left.
The meat accelerates in Rory’s direction.
(a) Find the force which Raoul is exerting.
(b) Find the magnitude of the acceleration.
kg. Each lion exerts a horizontal pull. Rory pulls with a force of 800 N. Aurora,
who is 120 degrees to Rory’s right, exerts a force of 400 N. Raoul is 140 degrees to Rory’s left.
The meat accelerates in Rory’s direction.
(a) Find the force which Raoul is exerting.
(b) Find the magnitude of the acceleration.
Mechanics | Relativity
if the speedometer of a car indicates a constant speed of 40 km/h, can the car accelerate? Why?
