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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
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Question
Answer
2
In one-dimensional motion where the direction is indicated by a plus or minus sign, the average velocity of an object has which of the following properties?It can be positive, negative, or zero.
2
In one-dimensional motion, the average speed of an object that moves from one place to another and then back to its original place has which of the following properties?It is positive.
2
In the case of constant acceleration, the average velocity equals the instantaneous velocity:half-way through the time interval.
2
Jeff throws a ball straight up. For which situation is the vertical velocity zero?at the top
2
John throws a rock down with speed 14 m/s from the top of a 30-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is the rock's speed just as it hits the ground?28 m/s
2
Maria throws two stones from the top edge of a building with a speed of 20 m/s. She throws one straight down and the other straight up. The first one hits the street in a time t1. How much later is it before the second stone hits?4 s
2
Mt. Everest is more than 8 000 m high. How fast would an object be moving if it could free fall to sea level after being released from an 8000-m elevation? (Ignore air resistance.)396 m/s
2
Norma releases a bowling ball from rest; it rolls down a ramp with constant acceleration. After half a second it has traveled 0.75 m. How far has it traveled after two seconds?12 m
2
Omar throws a rock down with speed 12 m/s from the top of a tower. The rock hits the ground after 2.0 s. What is the height of the tower? (air resistance is negligible)44 m
2
On a position versus time graph, the slope of the straight line joining two points on the plotted curve that are separated in time by the interval Dt, is which of the following quantities?average velocity
2
The distance of the Earth from the sun is 93 000 000 miles. If there are 3.15*10^7 s in one year, find the speed of the Earth in its orbit about the sun.18.6 miles/s
2
The slope of the acceleration vs. time curve represents:the rate of change of acceleration.
2
The value of an object's acceleration may be characterized in equivalent words by which of the following?rate of change of velocity
2
Two objects of different mass are released simultaneously from the top of a 20-m tower and fall to the ground. If air resistance is negligible, which statement best applies?Both objects hit the ground together.
2
When a drag strip vehicle reaches a velocity of 60 m/s, it begins a negative acceleration by releasing a drag chute and applying its brakes. While reducing its velocity back to zero, its acceleration along a straight line path is a constant -7.5 m/s2. What displacement does it undergo during this deceleration period?240 m
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