Physics Answers

6. A boat travels 12.0 m while it reduces its velocity from 9.5 m/s to 5.5 m/s. What is the magnitude of the boat’s acceleration while it travels the 12.0 m?

7. A 10-kg crate is pushed across a frictionless surface with a force of 30 N. What is its acceleration?

8. John had an acceleration of 0.35m/s^2. He traveled for 91 seconds with this acceleration. What would John’s final velocity be if he was initially moving at 2.0 m/s?

9.A car’s velocity is given by v (t) = 5 - 10t. Find the average acceleration between t = 2 and t = 5?

10. Given the position s(t)= - 2t^3 + 13t^2, where s is in meters and t is in seconds. Find the average velocity from t = 4 to t = 6.

1. A cat is moving at 18 m/s when it accelerates at 4 m/s^2 for 2 seconds. What is his new velocity?

2.A car slows from 22 m/s to 3.0 m/s at a constant rate of 2.1 m/s^2. How many seconds are required before the car is traveling 3.0 m/s?

3. A race car is traveling at +76 m/s when it slows down at -9 m/s^2 for 4 seconds. What is his new velocity?

4. A speedboat increases in speed uniformly from 20 m/s to 30 m/s in a distance of 200 m.   What is the acceleration of the speedboat?

5. Julie is walking around a track at a 2 m/s for some exercise. She then decides to start jogging so she accelerates at a rate of 0.5 m/s^2 for 3 seconds. How far did Julie travel from the time she started to accelerate to the end of the 3 seconds?

Calculate the molar mass of a liquid if 0.995g if it’s vapour occupy 250L at 200 degree cent and 45.0Torr

A 2200 kg truck encounters an average friction force of 785 N at interstate speeds. Suppose the truck accelerates from 25 m/s to 35 m/s over a distance of 350 m. Determine the amount of force generated by the truck’s drive-train in order to produce this result. 

Draw your own theoretical potential energy diagram that have equilibrium points (at least two)

Be sure to label the x and y axes of your graph. The line of the graph can

assume any shape, as long as the rules for drawing the potential energy

diagram are followed

The power source of a camera flash is a 1.5 V d.c. battery. The flash circuit converts this to 1.5V a.c. which is then increased to 300V a.c.

Assuming there are no energy losses, describe how the potential difference can be increased from 1.5V a.c. to 300V a.c.

You move a charge q from r_i = 9.1 m to r_f = 4.6 m from a fixed charge Q = 10.7 nC. What is the difference in potential for these two positions?

.The planet Vulcan was postulated to exist in an attempt to explain the precession of Mercury. How long will Vulcan make one complete revolution around the sun if its distance from the sun is two-thrids that of Mercury?

The equation of a particle executing in SHM is given by,y=24Sin(omegat+phi) , if

the time period is 30 second and the particle has a displacement of 12cm at t=0

, Calculate (i) epoch, (ii) the phase angle at t=10 secods and iii) the

phase difference between two positions of the particle “S” seconds apart

(where S is the last 2 digits of your student ID except invalid 0).

A ball is spinning in a vertical circle at the end of a string that is 3.0 m long . If the ball has a mass of 2.5 kg and moves at constant speed of 6.0m/s determine the tension in the string when the ball is at top of the loop. Determine the tension in the string when the ball is the bottom of the loop.