A car accelerates uniformly from rest to 26.5 m/s in 8.60 s along a level stretch of road. Ignoring friction, determine the average power required to accelerate the car if (a) the weight of the car is 7.76 x 10^3 N, and (b) the weight of the car is 1.83 x 10^4 N.

You are in a boat traveling perpendicular to waves in water. The wave speed is 8.40 m/s, your speed is 6.50 m/s, and you are heading into the waves. If the wavelength of the waves is 6.70 m, how much time passes between hitting the top of one wave and the next? [This Doppler effect in water is just like that in sound; you can also calculate it from velocities and length.]

_____________ s

Two carts (100 g and 150 g) on an air track are separated by a compression spring. The spring is released. Represent the process with a momentum bar chart (a) with one cart as the system and (b) with both carts as the system. (c) Write expressions for all the physical quantities you can from this information. Identify your object of reference.

Draw and explain the P-V graph for both adiabatic and isothermal processes and explain the difference.

A box with an inertia of 2kg is held on a 1m high table against a spring with k = 75N which is initially compressed 0.5m. The coefficient of friction between the box and the table is 0.2. The spring is released, and it pushes the box until it reaches its equilibrium length. At this point, the spring is stopped by a stopper and the box continues to slide across the table with only the force of friction acting on it. After losing contact with the spring, the box travels the distance of the rest of the table, another 0.5m, where it then flies off the end of the table and lands on the floor. Assuming no air resistance,

1. (a) What was the net work done on the box while it was being pushed by the spring?

2. (b) What was the net work done on the box from the time it left the spring until it reached the edge of the table?

3. (c) How fast was the box moving when it flew off the table?

4. (d) How far from the table did the box land?

Question about wave propagation

1. Explain what is: line of sight propagation, tropospheric propagation and ionospheric propagation.
2. What is fading? Why is diversity needed?
3. State the cause of ionospheric propagation.

an ideal gas has C_v=(7/2)R. A 2.00 mole sample of gas starts at P=1*10^5 Pa and T=300K. determine the total P, V&T for each of the following cases, as well as ΔE_int, W and Q

a) gas is heated at constant P to 400K

b) gas is heated at constant V to 400K

c) isothermal conpression to P=1.2*10^5 Pa

d) adiabatic to compression P= 1.2*10^5

Which of the following types of energy can be considered "mechanical" energy? (Select all that apply.)

A rocket is launched at an angle of 50.0° above the horizontal with an initial speed of 102 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 30.0 m/s². At this time, its engines fail and the rocket proceeds to move as a projectile.

(a) Find the maximum altitude reached by the rocket.
  m

(b) Find its total time of flight.
  s

(c) Find its horizontal range.

A cart is attached to a hanging mass by a string that passes over a pulley. a) Draw free-body diagrams for the cart and the hanging mass (Clearly label all forces present and indicate their relative magnitudes) when the cart is moving:(i) on a horizontal track.(ii) up a track inclined at an angle .b) When the cart moves on an incline at constant speed, it is in equilibrium; i.e., the net force on it is zero. Does it require more, less, or the same tension in the string to pull the cart up the track at constant speed or down the track at constant speed? Explain your answer.c)Derive an equation for the work done by friction when the cart is moving up the track at constant speed. Show your work.

Question 5: Describe why pulling a heavy object seems more hazardous than pushing it.

Question 6: What is the difference between local and whole body strength?

(a) By what percent does the period of a simple pendulum change if you double its amplitude? (Assume the amplitude is small.)

0%

41%    

70%

100%

(b) By what percent does the period of a simple pendulum change if you double its mass?

0%

41%    

70%

100%

(c) By what percent does the period of a simple pendulum change if you double its length?

0%

41%   

70%

100%

A flask with a volume of 1.50L , provided with a stopcock, contains ethane gas (C2H6) at a temperature of 310K and atmospheric pressure 1.013

A 4.92 kg particle-like object moves in a plane with velocity components v_x = 43.2 m/s and v_y = 35.7 m/s as it passes through the point with (x, y) coordinates of (5.46, -8.28) m. Just then, in unit-vector notation, what is its angular momentum relative to (a) the origin and (b) the point (-8.30, -8.30) m?