Other Physics Answers

1. In bench pressing 100 kg, a weight lifter applies a 1040 N force to the bottom of the bar.  

The magnetic force that earth exerts on a compass needle is less than the force that the compass needle exerts on earth.

A. True

B. False

State a hypothesis that would explain why a tennis ball, racquetball, ping pong ball, and golf ball bounced different heights when starting at one meter.

Calculate the index of refraction at 29° and 30°

The electric motor of a model train accelerates the train from rest to 0.620 m/s in 21.0cs. The total mass of the train is 875 g. Find the average power delivered to the train during the acceleration.

The guitar string wire in item 2 was 1.60 m long with a diameter of 0.20 cm. Approximately what tension force would break it?

A man travels due north in order to cross a river 5km wide following due East as 3km/h.If he can row at 10km/h in still water.How far from his destination will he land if he ignorantly steers northward

The guitar string wire in item 2 was 1.60 m long with a diameter of 0.20 cm. Approximately what tension force would break it?

Masking tape and ruler/ tape measure

Procedure:

1. Mark a starting point and place marks along a straight path at 10 cm, 40cm,

90 cm, 160 cm, and 250 cm from the start.

2. Clap a steady beat. On the first beat, the person walking the course should

be at the starting point. On the second beat, the walker should be on the

first mark, and so on.

3. Repeat step 2 while starting at the other end.

Think about It:

1. What happened to your speed as you move along the course? Infer what

would happen if the course were extended farther.

2. On your way back what happened to your speed?

Activity no. 1.6: Try this! Let’s Rock and Roll!

1. Ask your brother or sister to play basketball. Observe the ball when it is being

shoot without nothing to obstruct and repeat shooting and ask someone to block or obstruct.

What happened to the ball?