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With a 2 meter lever, the fulcrum is 30 cm from the load of 200 pounds. How much "effort" force will be needed to lift it?
Which type of lever describes a wheelbarrow?
A 35 N force is applied on a door knob, which is 0.6 meters from the axis. What is the torque?
What is the cross product of the vector (1,1,0) with (0,2,0) ? What is the magnitude, and what direction does it point?
An electron traveling horizontally to the right enters a region where a uniform electric field is directed downward. What is the direction of the electric force exerted on the electron once it enters the electric field? A. to the left B. to the ri..
A projectile is launched from level ground. When it lands, its direction of motion has rotated clockwise by 60 degrees. What was the launch angle.
Two converging lenses with focal lengths of 40cm and 20cm are 14cm apart. Calculate the image position and image height
In a physics lab, light with a wavelength of 570nmtravels in air from a laser to a photocell in a time of 17.0ns. What is the wavelength of the light in the glass
A 8.9 dog takes a nap in a canoe and wakes up to find the canoe has drifted out onto the lake but now is stationary. He walks along the length of the canoe at 0.54, relative to the water, and the canoe simultaneously moves in the opposite direction a..
A 54.2 g block of copper whose temperature is 400 K is placed in an insulating box with a 120 g block of lead whose temperature is 200 K. What is the change in the entropy of the system
A particle moves along a straight line with an acceleration of a = 2pi / (2s^(2/3) + 3s^(5/8)) m/s^2, where s is in meters. Determine the particles velocity when s = 2 m, if it starts from rest when s = 1m.
In 1911, Ernest Rutherford discovered the nucleus of the atom by observing the scattering of helium nuclei from gold nuclei. how close will the helium atom come to the gold nucleus
The same device can act as both an air conditioner and a heat pump (after all, they do the same thing), what is the coefficient of performance of the device acting as a heat pump
To correct myopia, is it necessary to move the image formed by the eye closer to or farther from the eyes lens system, Is the curvature of this lens concave or convex
A 1020kg artillery shell is fired from a battleship. While it is in the barrel of the gun, it experiences an acceleration of 2.1x10^4m/s^2. what net force is exterted on the artillery shell before it leaves the barrel of the gun
A friend of yours who starts out at the same age as you travels to the alpha centauri solar system which is 5.20 light-years away. How much older than your friend are you now
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