I need helpwith this physics worksheet ASAP. Why might a glass dropped from a he
ID: 1998563 • Letter: I
Question
I need helpwith this physics worksheet ASAP.
Why might a glass dropped from a height of one meter survive a fall onto a carpeted floor but not onto a concrete floor? A railroad diesel engine car weighs four times as much as a freightcar. If the diesel engine coasts at 5 km/hr into a freight car that is initially at rest, how fast do the two go after they attach together? A 5.0 kg fish swimming at 1.0 m/s swallows an absent-minded 1.0 kg fish at rest What is the speed of the larger fish right after swallowing the 1.0 kg fish? and units. Why would the answer to the previous problem be different if the 1.0 kg was not initially at rest? A person wearing a heavy coat is at rest in the middle of a frozen pond and must get to shore. How can this be accomplished using only the coat? A car with a mass of 1, 295 kg is traveling at 18 m/s (about 40 mph). What braking force is needed to bring the car to stop in 9.0 seconds? If you throw a ball horizontally while standing on rollerblades, you will roll backward with a momentum that matches that of the ball, but in the opposite direction. Will you roll backward if you go through the motion of throwing the ball, but instead hold onto it? Explain. Why is it difficult for a firefighter to hold a hose that ejects large amounts of water at a high speed? In terms of impulse and momentum, why are nylon ropes, which stretch considerably under stress, favored by mountain climbers? If a Mack truck and a motorcycle have a head-on collision, which vehicle will experience the greater force of impact? The greater impulse? The greater change in momentum? The greater acceleration?Explanation / Answer
1)
the glass dropped at the carpeted floor may survide and as the carpet floor is softer and the glass moveds larger distance before stopping
2)
let the final speed is v
Using conservation of angular velocity
(5* 4m) = (m + 4m) * vf
vf = 3.75 km/hr
the speed of cars after the attach is 3.75 m/s
3)
Using conservation of momentum
5 * 1 + 1 * 0 = (5 + 1) * v
v = 0.833 m/s
the speed of fish right after swallowing is 0.833 m/s
4)
if the fish was not initially at rest , the initial momentum of the system will be different and hence the answer to the previous problem will be different