How many revolutions does it make during the time
A motor spins an 2 kg block around on an 80 cm arm at 200 rpm. The blosk is supported by a steel table after the motor stops. How long does the block take to come to rest? How many revolutions does it make during this time?
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The first place is between the charges and is 4.4 cm to the left of the negative charge. The second place is 8.4 cm to the right of the negative charge. (a) What is the distance between the charges?
100 g of ice at 0 degrees C and 100 g of steam at 100 degrees C interact thermally in a well-insulated container. What is the final state of the system?
An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not?
A mass m hanging on a spring has a natural frequency f. If the mass is increased to 4 m, what is the new natural frequency?
A student m = 97 kg runs at a velocity vi = 2.85 m/s before jumping on a skateboard. After jumping on the board the student has a velocity vf = 2.35 m/s. What is the mass of the skateboard in kg?
A body weighs 6 grams when placed on one pan and 24 grams when placed on the other pan of a defective beam balance according to the reading shown on the instrument. If the beam is horizontal when both pans are empty, what is the true weight of the
Suppose that you want to take a photograph of yourself as you look at your image in a mirror 3.8 m away. For what distance should the camera lens be focused?
High voltage power transmission lines are made out of aluminum with a crosssectional area of about 4.4 x 10-4m^2. These lines typically carry currents of 1.3-A.
Calculate the frictional force needed for a 900 kg car traveling around a 500 m radius curve at 25 m/s, if the car is to continue moving in a circle and not slide. Assume an unbanked curve.
The amount of radiant power produced by the sun is approximately 3.9 x 1026 W. Assuming the sun to be a perfect blackbody sphere with a radius of 6.96 x 108 m, find its surface temperature (in kelvins).
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