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Problem 1: A box is lowered by a rope at a constant speed. If its mass is 20 lb, its downward speed is 3 ft/s, and the vertical distance of travel is 25 ft, what is the work done by the rope on the box?
problem 2: A box is lowered by a rope at a constant acceleration. If its mass is 45 lb, its downward acceleration is 2.8 ft/s2, and the vertical distance of travel is 22 ft, what is the work done by the rope on the box?
A stone is thrown horizontally at 70.0 m/s from the top of a very tall cliff. Calculate its horizontal position and vertical position at 2.00 s intervals for the first 10.0s
If you were on a spaceship traveling a 0.5c away from a star, at what speed would the starlight pass you
the department of labor would like to estimate the average weekly wages for us adults with a margin of error equal to
In an insulated vessel, 260 g of ice at0°C is added to 630 g of water at19.0°C. What is the final temperature of the system? How much ice remains when the system reaches equilibrium?
A converging lens has a focal length on both sides of 24.0 cm. An object is placed to the left of the lens at 14.0 cm. The object is 8.0 cm in height. Is the image to the left or right of the lens
Two loud speakers face each other, vibrate in phase, and produceidentical 451 Hz tones. A listening walks from one speakertoward the other at a constant speed and hears the loudness change(loud-soft-loud) at a frenquency of 2.84 Hz.
A mass-on-a-spring system has a spring constant k =372 N/m and a mass m =0.46 kg. If it is given an initial displacement of0.27 m and then released, what is theinitial potential energy of the oscillator?
A rod is initially at a uniform temperature of 0 o C throughout. One end is kept at 0oC , and the other is brought into contact with a steam bath at 100 o C.
A 24-V battery is connected in series with a resistor and an inductor, with R = 2.4 ? and L = 8.6 H, respectively. Find the energy stored in the inductor when the current reaches its maximum value
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. find the tension in the tightrope
Positive point-charges of +36.0 mC (Micro C) are fixed at two of the vertices of an equilateral triangle with sides of 3.30 m, located in vacuum. Determine the magnitude of the E-field at the third vertex
An undiscovered planet, many lightyears from Earth, has one moon in a periodic orbit. This moon takes 1710 * 10^3 seconds, calculate the moon\'s radial acceleration.
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