Mechanics | Relativity Answers

The average angular acceleration of a stone lodged in a rotating car wheel is 2 100 rads . What will the stone’s final angular speed be after 3.0 s, if it starts from rest? Also calculate its angular displacement during this time.

the diagram shows a stationary cable car which is used to take passengers between different areas in the theme park

a) the weight of the car plus passengers is 18000N. calculate tension in the cable car for the diagram

100mil/h=?m/s

1.      Where does this catapult/trebuchet exhibit potential energy? Where does it exhibit kinetic energy?

1.      How does the size of the arm or angle effect on the distance traveled? Why?

2.      Using a ruler or protractor, measure three different positions for the arm or angle of the catapult/trebuchet. Using these three placements, launch the marble ball from each. Measure the distance each of the launches went. (Insert a documentary picture while launching the projectile)

2. Your phone slips from your pocket as you’re going up a ladder of a high building.

Your phone falls for 2.7 seconds before you heart it hit the cement below.

a. At what height did the phone fall from? (Hint: Your phone’s initial velocity is

zero.)

b. What was the velocity of your phone when it hit the cement?

Convert the following frequencies to wavelengths (please present the final answer in the most appropriate units to present the quantities in a succinct manner):

a. 10.37 Hz

b. 400.1 MHz

c. 1.91 GHz

d. 79 GHz

e. 167 MHz

 Convert the following wavelengths to frequencies (Hz):

a. 0.71 μm

b. 31.20 μm

c. 419 nm

d. 1385 nm

e. 17.31 cm 

Calculate the total radiant exitance (W∙m-2) for the following blackbody temperatures:

a. 250 K

b. 13°C

c. 981 K

d. -28°C

e. 273.15 K 

How much energy does a quantum of electromagnetic energy at 400 nm contain? How much more or less is this than a quantum of electromagnetic energy at 2.7 μm? 

 Based on the inverse square law, at distance d = 5 m: (a) what is the total area over which energy is dispersed? (b) what is the fraction of the total area represented by the total dispersal area compared to d = 1?