Other Physics Answers

Activity 9: Provide the answers to the questions provided.

1. You go outside wearing your face mask and face shield and do some errands. All your stops are along one straight road. You walk 150m east to the sari-sari store, then buy milk tea at the shop 50m to the east away from the sari-sari store, then go to the 7/11

100m to the east away from the milk tea shop to pay some bills.

Afterwards, you walk all the way back home.

a. What distance did you travel when you went to do your errands?

b. What is your displacement from the moment you left your house to coming back

home?

How much work did a room attendant have done in pushing the service trolley by a force of 33.0 N to a distance of 8.25 m with an angle of 66.2 degrees.

Find the range of an arrow that leaves the box at 50 m/s at ang angle of 50o above the horizontal?

1. In an engine, 200 g piston oscillates in simple harmonic motion with displacement

varying according to x(t) = 5 cos 2t where x is in meter and t is in second.

a) Write the expression for its velocity as a function of time

b) Sketch a graph of velocity against time of the piston for the first complete cycle

starting from t = 0.

c) Calculate the maximum acceleration of the system

d) Calculate the total energy of the system

A rocket initially at rest steadily gains speed for 2.80s while traveling upwards 20.0m.

what was the rocket's final speed?

A world-class sprinter can burst out of the blocks to essentially top speed (of about 11.5 m/s) in the first 15.0 m of the race. What is the average acceleration of this sprinter, and how long does it take her to reach that speed?

Create a short video demonstrating Newton’s third law, using an example not presented in this activity (for instance, you cannot use the example of a pop can sitting on a table). Be creative!

In your video:

Identify the two objects exerting the action and reaction forces.

Describe how the reaction force affects the first object, and how the reaction force affects the second object.

If your objects are in motion, demonstrate the motion.

While the video does not have to include you narrating, at some point, please show yourself in the video.

If your video features a friend or family member, or even a stranger, be sure to get their permission first, before using the video