PHY 111/113 r1.1] A model rocket accelerates upward off the ground until it runs
ID: 2269040 • Letter: P
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PHY 111/113 r1.1] A model rocket accelerates upward off the ground until it runs out of fuel. After the fuel runs out, it behaves like 1.2] When an object slows down, what is the relationship between the object's velocity and acceleration? Briefly explain 2.1] You exert the same impulse on objects A and B. Object A ends up moving four times faster than Object B. What can 2.2] If an object Concepts Spring 2018 a projectile under the influence of the Earth's gravity. Sketch velocity-time and position-time graphs that depict t rocket's motion from takeoff until it reaches its peak height. Indicate the time at which the rocket ran out of fuel your answer you conclude about the masses of each object? Assume that yours is the only impulse and the two objects were at rest before you pushed on them. appears to accelerate, why can't you conclude that there is something causing it to do so without assuming an inertial reference frame? Quantitative Spring 2018 1] A jet accelerates at a 3.92 m/s from rest until it reaches its takeoff velocity of 360 km/hr. It has to travel for 5 seconds at its takeoff velocity before taking off. What's the minimum distance that the jet will travel on the runway? 2] The driving distance between Dartmouth to Boston is about 55 miles. You spend half the time driving to Boston at an average speed of 60 mi/hr. However, for the second half of the trip time, some bad traffic sl of 10 mi/hr. How long did it take to get to Boston? What distance did you cover during the first half of the trip time period versus the second half? ow cra | A 5 kg block slides on a 3 meter long, 30 kg table. It has a speed of 4 m/s when it starts moving across the table and eventually comes to rest relative to the table due to sliding friction. The table however, is on frictionless rollers and ns to move while the block slides on top of it. How fast are the brick and table moving together once the block begi stops sliding? George and Martha are enjoying a nice game of air hockey. While the 100 gram puck is at rest, Martha whacks it sending it across the table at 10 m/s. George doesn't have time to move his paddle, but by sheer luck, the puck rebounds off of it, and drifts slowly away at a rate of 20 cm/s. How much impulse did Martha exert on the puck? How much of an impulse did the puck exert on George's paddle? Assume that the puck moves frictionlessly across the tableExplanation / Answer
2.1 ) velocity = 360 km/hr
= 360*5/18 = 100 m/s
v^2 - u^2 = 2aS
100^2 - 0 = 2*3.92*S
S1 = 1275.5 m
S2 = 100*5 = 500 m
Total distance travelled = 1275.5 + 500 = 1775.5 m
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