Two automobiles of equal mass approach an intersection. One vehicle is traveling with velocity 14.0 m/s toward the east and the other is traveling north with speed var Neither driver sees the other. The vehicles collide in the intersection and stick together, leaving parallel skid marks at an angle of S8.5° north of east. Determine the initial speed va, of the northward-moving vehicle. m/s The speed limit for both roads is 35 mi/h and the driver of the northward-moving vehicle claims he was within the speed limit when the collision occurred. Is he telling the truth?

NASA's Saturn V rockets that launched astronauts to the moon were powered by the strongest rocket engine ever developed, providing 6.77 ✕ 106 N of thrust while burning fuel at a rate of 2.63 ✕ 103 kg/s. Calculate the engine's exhaust speed (in m/s). HINT  m/s

A car (VW) and a truck (C) collide inelastically (stick together). The impact is made in a very short time of Δt = 0.1 s. Initial speeds:UVW = 40.0 m / sUC = 30.0 m / sMasses:MVW = 900.0 kgMC = 2000.0 kg d) Determine the average vector accelerationAVW =                     AC = e) Vector average force on C and VW. (Do you notice something important in the results?).FVW =                        FC = f) For the case of truck C, determine its :   ΔP = Solve all subsections

A car of mass m moves with a speed of Vo. The driver suddenly sees another car, of mass 3m, sitting at rest. The driver slams on the brakes. The coefficent of kinetic friction between the car and the road is μk. a) How far away must the second car be if the first car is to stop exactly in time to avoid hitting it? b) Suppose the car is a distance of d/2 away where d is the distance you found in part (a). Find the momentum of the car as it collides with the car at rest. c) Use conservation of momentum to calculate the speeds of both cars after the collision.

A tennis player receives a shot with the ball (m = 0.060 kg) travelling horizontally at 50.0 m/s and returns the shot with the ball travelling horizontally at 40.o m/s.  If the racquet was in contact with the ball for 0.015 seconds, find the force of the racquet on the ball.

A rocket is fired in a gravity-free environment in deep space. The rocket has an initial mass of 9500 kg and ejects gas with a velocity of 2450 m/s. The rocket fires for 4.40 s. Calculate the mass (in kg) of the gas that must be ejected in the time given to give the rocket an acceleration of 49.50 m/s2

One study suggests that a brain concussion can occur if a person’s head is subjected to an acceleration assmall as 60g, where g is the acceleration of gravity. (a) If the massof the person’s head is 4.8 kg, what is the magnitude of the force?(b) If the impulse delivered to the person’s head is 18 kg # m>s, overwhat time interval is the force applied?

A 4.00 g bullet has a muzzle velocity of 250 m/s when fired by a rifle with a weight of 25.0 N. (a) Determine the recoil speed (in m/s) of the rifle. m/s (b) If a marksman with a weight of 775 N holds the rifle firmly against his shoulder, determine the recoil speed (in m/s) of the shooter and rifle. m/s Additional Materials O Reading

During a collision with a wall, the velocity of a 0.200-kg ball changes from25.0 m/stowardthe wall to 20.0m/s away from the wall. If the time the ball was in contact with the wall was 0.03s, what was the magnitude of the average force the wall applied on the ball?

d and e