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A ball is thrown straight upward and returns to the thrower's hand after 2.70 s in the air. A second ballis thrown at an angle of 29.0° with the horizontal. At what speed must the second ball be thrown so that it reaches the same height as the one thrown vertically?
A typical wall outlet is 120 volts in the U. S. Personal MP3 players require much smaller voltages, calculate the number of turns on the secondary coil of the adapter transformer
A man holds a 190 N ball in his hand, with the forearm horizontal. Find magnitude and direction of the force applied by the upper arm bone to the forearm at the elbow joint
A pencil (mass 5.8g and length 8.3cm) is at first balanced so that it is sitting vertically on a flat table. If the pencil then falls, find its angular velocity just before it strikes the tabletop. Assume that the mass of the pencil is distributed un..
Two point charges 1.9cm apart have an electric potential energy -150?J . The total charge is 30nC
A 1000 kg roller coaster car starts from rest from a hilltop 80.0 m above the ground, find the average frictional force between the car's wheels and the track
A window air conditioner unit absorbs 9.85 104 J of heat per minute from the room being cooled and in the same time period deposits 1.47 105 J of heat into the outside air. What is the energy efficiency rating of the unit
An object glides on a horizontal tabletop with a coefficient of kinetic friction of 0.3. If it comes to rest after 1.3 seconds, what was its initial velocity
A 15.0 m uniform ladder weighing 500 N rests against a frictionless wall. The ladder makes a 60.0 angle with the horizontal. Find out the horizontal and vertical forces the ground exerts on the base of the ladder when an 800 N fire-fighter is 4.00m f..
Zartan of the jungle crosses a river by grabbing an 8 m long vine, conveniently hanging from a strong branch, and swinging over the water. find his acceleration and the tension in the vine
Astronomers discover an exoplanet (a planet of a star other than the Sun) that has an orbital period of 3.85 Earth years in its circular orbit around its sun, Find the radius of the exoplanet\'s orbit
As a summer intern for a microscope company, you are designing a compound microscope for a client that provides you with the following information. determine the barrel length needed for the microscope
Two charges, +4.0x 10-8C and -2.0 x 10-8C are separated by 12 cm. Calculate the net force on the third charge
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