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Q. A 250 kg car starting from rest is pushed 30m. While the car reaches 30m, it's travelling at a speed of 12 m/s and it encounters 52N of friction. What is the acceleration of car and what is the force of the push on the car?
Q. The crest of the second hill is circular, with a radius of r = 35m. Avoid friction and air resistance. What must be the height h of the first hill so that skier just loses contact with the snow at the crest of the second hill?
Compute the scalar product V.F
A block has an initial speed V(o) > 0 on a linear trajectory on the surface with friction coefficient u and air resistance (F = cv^2). Derive an equation that will represent the velocity (V) as a function of the position of the block (x). So V(x).
Determine the greatest vertical displacement of the pendulum (height). The mass lost by the rocket during these 30.0 is negligible. What impulse does an engine impart to the rocket?
plan a free-body diagram for the charge.
suppose that the engineer is at x = 0 when, at t = 0, he first spots the locomotive. Sketch x(t) curves for the locomotive and high-speed train for the cases in which a collision is just avoided and is not quite avoided.
How much horizontal force should a sprinter of mass 57.0 exert on the starting blocks to produce this acceleration.
When subject to a steady acceleration of 0.500 g the object must be located 0.350 cm from its equilibrium position. Find out the force constant required for the spring.
At the very bottom of the circle, a too sharp knife is suddenly inserted to cut the string directly below the point of support. How far to the right of where the string was cut does the ball hit the floor.
A train at a constant 75 km/h moves east for 48 min, then in a direction 61.0° east of due north for 11min, and then west for 67 min.
An airplane is flying with a velocity of 86.0 at an angle of 23.0 above the horizontal. When the plane is a distance 114 straight above a dog that is standing on level ground, a suitcase drops out of the luggage compartment.
Consider the four masses. Find the total gravitational potential energy of this system. How does your answer to part A change if all the masses in the system are doubled.
A 7.40-nC charge is positioned 1.70 m from a 4.80-nC charge. (a) Find the magnitude of electrostatic force that one particle exerts on the other. (b) Is the force attractive or repulsive.
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