Other Physics Answers

Materials: 2 rubber bonds and ruler/ tape measure

Procedure:

1. Tie the two rubber bond together.

2. Each person should pull back the end of the rubber bond. Record the two

readings using a ruler or tape measure.

Try to observe somebody in your place in a bicycle and ask to turn to the right

suddenly, which way does the body go and why?

A physics major is cooking breakfast when she notices that the frictional force

between her steel spatula and Teflon frying pan is only 0.200 N. Knowing the

coefficient of kinetic friction between the two materials, she quickly calculates

the normal force. What is it?

___________________________________

Fill in the blanks. Write your answer on the provided answer sheet.

An object undergoing uniform circular motion has an acceleration pointed at the

_____________ although the speed is ___________________. The time it takes to complete one full circle is called _________________________.

The coefficient of linear expansion of steel is  

12 × 10^-6/C°. A railroad track is made of individual rails of steel 1.0 km in length. By what length would these rails change between a cold day when the temperature is –10 °C and a hot day at 30 °C?

1. A sound wave in air of pressure level 10dB strikes, with normal incidence, a

boundary between air and a second medium for which ρc= 840kgm^-2s^-1.

Find,

(a) the rms pressure in the reflected wave

(b) the rms pressure in the reflected wave

(c) the phase relationship at the boundary between these two instantaneous pressures and the instantaneous pressure in the incident wave.

2. A pulsing sphere has a radius of 1.00mm and is pulsing in air at a frequency of

100Hz. The maximum radial velocity of its surface is 0.10cms0-1.

(a) Find the value of the velocity potential ,Φ, as a function of r.

(b) At a position r=30m, find

(i) the maximum value ofΦ.

(ii)the maximum value of ξ &

(iii) the maximum value of p.

Ellen throws a ball toward a wall at speed 30.0 m/s and at angle 45.0° above the

horizontal. The wall is distance 25.0 m from the release point of the ball.

a) (5%) How far above the release point does the ball hit the wall?

b) (5%) What is the horizontal component of its velocity as it hits the wall?

c)

(5%) What is the vertical component of its velocity as it hits the wall?

d

(5%) When it hits, has it passed the highest point on its trajectory?

An 85 kg person is parachuting and experiencing a downward acceleration of 4.5 m/s2. The

mass of the parachute is 4.0 kg.

a) (10%) Draw free body diagram.

b) (10%) What is the upward force on the open parachute from the air?

C)

(10%) What is the downward force on the parachute from the person?

2. The ball is tied to a string to whirl it having a radius of 50 cm at a velocity

of 1.2 m/s. What will be the acceleration of the ball?

vector has y components ay= 13.0m