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The workman wants to push a box up a 20.0 degree incline. If it takes 70 Newtons of force to start the box moving, how heavy is the box?
When a person is given intravenous fluid, the bag containing the fluid is typically held about 0.9 m above the person's body. what is the pressure in the person's blood
A 1200kg car rounds a curve of radius 65 m banked at an angle of 14degrees. if the car is traveling at 30km/hr, will a friction force be required? if so, how much and in what direction.
After flying for 15 min in a wind blowing 42 km/h at an angle of 28° south of east, What is the speed of the airplane relative to the air
a man sitting in a bosun's chair that dangles from a massless rope, which runs over a massless frictionless pulley, In each of the four cases, what is the force exerted on the ceiling by the pulley system
A 60kg boy and a 45 kg girl use an elastic rope while engaged in a tug-of-war on a frictionless icy surface. If the acceleration of the girl toward the boy is 2.3 m/s2, find the magnitude of the acceleration of the boy toward the girl.
Two very small objects, whose charges are +1.0 and -1.0 C, Find the magnitude of the attractive force that either charge exerts on the other
Two point charges 1.9cm apart have an electric potential energy -150?J . The total charge is 30nC
An armadillo and Earth attract each other gravitationally. Which experiences the greater gravitational force, or do they experience the same force magnitude?
An outfielder throws a 0.150 kg baseball at a speed of 54.0 m/s and an initial angle of 30.0°. What is the kinetic energy of the ball at the highest point of its motion
An iron tower in is 399 meters tall on a cold day (T = -6.7 degrees Celsius). What is its height of the tower on a hot day while the temperature is 31.5 degrees Celsius.
find the lowest frequency that make constructive interference.
A laser emits a light beam with a power of 5 mW. How many photons per second does this laser emit
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