Other Physics Answers

1. Several environmental scientists are monitoring the movement of a cheetah on an Ethiopian plain. They find that at t = 5 min, the cheetah is traveling at 5 m/s due west. At t = 15 min, it is moving at 12 m/s toward the west, while at t = 30 min it is moving at 2 m/s toward the east. If we call western movement positive, when is the cheetah’s speed negative? A) During the entire interval from t = 15 to t = 30 min B) Only during part of the interval from t = 15 to t = 30 min C) During at least part of the interval from t = 15 to t = 30 min, and possibly at other times D) Never, since speed is not a vector quantity

1. Given the potential and actual supply and demand situation,will there be a lot of opportunities open for your existing or envisioned enterprise in the future?

2. What are they?

3. How attractive are these opportunities?

4. What are the major threats to the supply and demand situation in the future?

What are the major opportunities and threats in the Industry that you expected to participate in?

A child is pushing a merry-go-round. The angle through which the merry-go-round has turned varies with time according to θ(t)= γt+ βt³, where γ = 0.400 rad/s and β = 0.0120 rad/s³.

a) Calculate the angular velocity of the merry-go-round as a function of time.

b) What is the initial value of the angular velocity?

c) Calculate the instantaneous value of the angular velocity ω_z at t=0 to t= 5.00 s. Show that the w_av-z is not equal to the average of the instantaneous angular velocities at t=0 and t=5.00 s, and explain why it is not.

A child is pushing a merry-go-round. The angle through which the merry-go-round has turned varies with time according to θ(t)= γt+ βt³, where γ = 0.406 rad/s and β = 1.30×10⁻² rad/s³.

a) Calculate the angular velocity of the merry-go-round as a function of time.

b) What is the initial value of the angular velocity?

c) Calculate the instantaneous value of the angular velocity ω_z at t=0 to t= 5.00 s. Show that the w_av-z is not equal to the average of the instantaneous angular velocities at t=0 and t=5.00 s, and explain why it is not.

Find the magnitude and direction of the net gravitational force on mass A due to masse B and C. Each mass is 2.00 kg

(a) A<-10cm<->C<-------40cm----->B

(b) C<-10cm<->A<-------40cm----->B

a vibration of frequency 5 Hz sends a wave of wavelength 0.8 m down a rope. What is the speed of the wave

A 10.00 CM tall light bulb is placed at a distance of 90.0 CM from a concave mirror

having a focal length of 21 CM Determine the image distance and the image size

What is matter made of?

Adjacent antinodes of a standing wave on a string are 15.0 cm apart. A particle at an antinode oscillates in simple harmonic motion with amplitude 0.850 cm and period 0.0750 s. The string lies along the +x-axis and is fixed at x = 0. (a) How far apart are the adjacent nodes? (b) What are the wavelength, amplitude, and speed of the two traveling waves that form this pattern? (c) Find the maximum and minimum transverse speeds of a point at an antinode. (d) What is the shortest distance along the string between a node and an antinode?