# Project #41341 - Physics (11 Questions)

17 Physics Questions:

1. It takes approx. 10^-3 seconds for a nerve to fire.  Assuming one nerve impulse must end before another can begin.

A. Aprrox what is the maximum firing rate of a nerve in impulses per second? (Numeric Value).

2 If a car is traveling at a speed of 33 m/s and the speed limit is 78 km/h how many kilometers would the car need to slow down to be going the speed limit?

3. Suppose your bathroom scale reads your mass as 65 kg with 3% uncertainty.

A. What is the uncertainty in your mass, in kilograms?

4. Given the numbers a=93, b=109.

A.  Determine the number of significant figures in a.  The number of significant figures in b.

B. If the uncertainty of a is 2, what is the percent uncertainty? If the uncertainty of  b is 2, what is the percent uncertainty?

5. A football quarter back runs 12 m straight down the playing field in 2.3 seconds (in the positive direction). He is then hit and pushed 1.5 m straight backwards in 1.95 seconds. He breaks the tackle and runs straight forward another 16 m in 4.2 seconds.

d1=12m

d2=1.5 m

d3=16m

t1=2.3s

t2=1.95s

t3=4.2 s

A. Calculate the quarterback's average velocity in the horizontal direction during the first interval, in meters per second.

B. Calculate the quarterbacks's average velocity in the horizontal direction during the second interval, in meters per second.

C. Calculate the quarterback's average velocity in the horizontal direction during the third interval, in meters per second.

D. Calculate the quarterback's average velocity in the horizontal direction for the entire motion, in meters per second.

6. At the end of a race, a runner decelerates from a velocity of 9 m/s^2. Take the runner's initial velocity at the end of the race to be in the positive direction.

A. How far does she travel in the next 5 s?

B. What is her final velocity, in meters per second?

7. Suppose you walk 16.5 m straight west and then 22 m straight north.

A. How far are you, in meters, from your starting point?

B. What is the compass direction, in degrees measured West of North, of a line connecting your starting point to your final position?

8. In an attempt to escape his island, Gilligan builds a raft and sets to sea. The wind shifts a great deal during the day, and he is blown along the following straight lines: 2.05 km 45.0 degrees north of west; then 4.85 km 60.0 degrees south of east; then 1.4 km 25.0 degrees south of west; then 5.05 km straight east of north; then 7.1 km 55.0 degrees south of west; and finally 2.7 km 10.0 degrees north of east.

A. What is the distance of his final position from the island in km?

B, What is the angle of his final position relative to the island? Give your answer in degrees S of E.

9. A ball is kickied with an initial velocity of 17.5 m/s in the horizontal direction and 13 m/s in the vertical direction.

A. At what speed does the ball hit the round in m/s?

B. For how long does the ball remain the air in seconds?

C. What maximum height is attained by the ball in meters?

10.  A child throws a penny off the Eiffel tower (h=324m) with a downward velocity of magnitude Vo=6m/s.

A. What is the correct expression for the time t, it takes for the penny to reach the ground? Neglet air resistance.

B. Calculate the time t, in seconds, that it takes for the penny to fall.

C. Find the speed at which the penny strikes the ground , in meters per second, using the initial velocity and the drop distance.

11. A bullet is shot straight up into the air from ground level. It reaches a maximum height at h=760 m.

A. Calculate the speed of the bullet in m/s.

B. Using your previous result, calculate the total flight time, in seconds, until the bullet hits the ground.

 Subject General Due By (Pacific Time) 09/27/2014 12:00 pm
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