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A 1 kg object is released from rest at an unknown height h above the ground. What is the initial height if it hits the ground at 10 m/s?
Two thermal reservoirs ("hot", TH = 124°C and "cold", TC = 10.0°C) are put into thermal contact by a lead slab. Find the initial rate of heat conduction for each reservoir
A cockroach of mass m lies on the rim of a uniform disk of mass 4m that can rotate freely about its center like a merry-go-round. estimate the angular velocity of the cockroach-disk system
A copper wire has a resistance of 0.400 at 20.0°C, and an iron wire has a resistance of 0.430 at the same temperature
An electron with an initial speed of 4.90×105m/s is brought to rest by an electric field. What was the potential difference that stopped the electron
Two people carry a heavy electric motor by placing it on a light board 1.50{\rm m} long. One person lifts at one end with a force of 370{\rm N} , What is the weight of the motor
Two charges q = +8.0 µC are fixed a distance d = 9.0 cm apart. You bring a third charge q = +8.0 µC from infinity to C. How much work must you do
A soccer ball lying on the ground is kicked with an initial velocity of 10.0 m/s at an angle of 37 degrees above the horizontal. How far over does it land on the ground?
A bat emits a sound whose frequency is 70.9 kHz. The speed of sound in air at 20.0 oC is 343 m/s. However, the air temperature is 40.4 oC, find the wavelength of the sound
A mass M is suspended using two cables which make angles of theta_1 and theta_2 with the horizontal across the top. What is the tension (T_1) in the left-handed cable
A wire is formed into a circle having a diameter of 10.3 cm and is placed in a uniform magnetic field of 2.84 mT. Find the maximum torque on the wire
An intergalactic rock star bangs his drum every 1.70 s. How fast is the rock star moving relative to the earth
Five computers are plugged into 120V wall outlet in parallel. Each computer has a resistance of 50ohm when running. a) Sketch the schemetic of this circuit. b) Calculate the effective ressitance.
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