A rocket is propelled forward as very high speed gases are ejected out of its back. Which one of the following is the best explanation as to why the rocket is propelled forward? A) The high speed gases push on the rocket as they are ejected and propel it forward. B) The rocket is propelled forward because both energy and momentum must be conserved. c) The rocket is propelled forward due to the conservation of momentum. D Because the gases are pushing against the air, the air propels the rocket forward.

A 200-g bullet, initially travelling at 400 m/s, collides with a 1.50 kg block that sits on the edge of a tabletop 1.00 m above the floor.   After 3.0 ms, the bullet has embedded in the block.  Subsequently, the combination is launched onto the floor.     What is the velocity of the combination after the collision? What is the magnitude of the average force acting on the block during the collision? How much energy was lost in the collision? How far horizontally did the combination travel before hitting the floor?  Assume air resistance is negligible. If the bullet was travelling twice as fast, by what factor would your answer to (d) change?

A 1kg object with initial speed v collides with a 2kg object (which is initially standing still). The objects stick together in a perfectly inelastic collision. Check all the following answers which are true statements. There may be more than one correct answer! The total kinetic energy (in the form of moving objects) is the same before and after the collision. More than 50% of the initial momentum is converted to non-conservative work. The final speed of the objects is v. More than 50% of the initial kinetic energy is converted to non-conservative work. The total momentum is the same before and after the collision.

When no energy is lost to thermal modes in a collision, the coefficient of restitution is e = 1. This represents the ideal golfing equipment. The legal maximum is e = 0.83. A 200-g clubhead moving at 88 mph strikes a golf ball. The mass of the golf ball is 45 g. Determine the amount of energy that winds up as KEclubhead, KEball, and Etherm for e = 0.83. Round the final answer to two decimal places.

The reason why I used 2g instead than g is that I have to cancel  2 "g" from the left side. Meaning I had to add 1/2g on the right side. Why are you instead adding only 1/g? Sorry, sometimes I get lost in the simple steps.

A 30-caliber rifle with a mass of 3.14 kg fires a 9.33- g bullet with a speed of 596 m/s with respect to the ground. What kinetic energy is released by the explosion of the gunpowder that fires the bullet? (Note there is a tolerance 0.1 percent for the answer)

The following are multiple choice questions. No explanations required.Choose the correct answer    g) Two balls are dropped from the same height. Both balls bounce (perfectly elastic) when they hit theground. Ball A has half the mass of ball B. Which ball has a greater speed after the bounce?h) Two balls are thrown from the same initial height above the ground. Ball A is thrown straight down.Ball B is thrown straight up. Both balls have the same initial speed. Which ball has the larger speedwhen it hits the ground?i) Two identical balls roll down a frictionless track. The tracks are the same height from top to bottom.Track A is straight and track B is curved. If both balls are released from rest, which ball reaches thebottom with the larger speed?j) You see two identical freight trucks driving down the highway. In both cases, the trailer is bouncing upand down on its springs. Truck A is heavier than truck B. Which truck bounces with a higher frequency?

A truck (m=5000 kg) initially moving at 5 m/s slams into the back of a car (m=1,000 kg) that is sitting at an intersection. The bumpers lock, and the two vehicles move off together. In the instant right after the collision, what is the speed of this wreckage? How much energy is dissipated? v = 5 m/s 100-160 m=5,000 kg m=1,000 kg

Jermaine is riding his skateboard around the playground when he “accidentally” bumps into his older brother, Tito, who is sitting motionless on a swing. Jermaine’s mass is 35 kg and Tito’s mass is 45 kg and Jermaine comes to rest because of the collision. If Tito swings up to a height of 0.50 m above his starting position because of the collision, how fast was Jermaine moving just before the collision

please help me with this problem. Given: A ball of clay mass M/8 A larger mass as known as M is attached to a spring with spring constant k. A ball of clay mass "M/8" moves with speed "v" towards a larger mass M. As the a ball of clay hit and sticks on the a larger mass who was initially still. a) What would be the speed of the combination after the collision? b) How much did the spring compressed c) How long did it take for the spring to be compressed due to the collision?