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A sledge loaded with bricks has a total mass of 17.5 kg and is pulled at constant speed by a rope inclined at 20.3° above the horizontal. The sledge moves a distance of 20.5 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.500.
What is the mechanical energy lost due to friction?
Under such extreme conditions, protons and electrons are squeezed to form neutrons, giving birth to a neutron star. Neutron stars are massively heavy - a teaspoon of the substance of a neutron star would weigh
A 12kg runaway grocery cart runs into a spring with spring constant 210 N/m and compresses it by 70 cm .What was the speed of the cart just before it hit the spring.
Two radio antennas operating at 6.00 Mhz are separated by 120.0m along a North-South line. Find the directions on the compass in which no radiation is sent out
A round loop of diameter 12 cm, carrying a current of 0.40 A, is placed inside a magnetic field B = 0.20 i T + 0.40 j T. What is the potential energy of the loop
The press box at a baseball park is 30 ft above the ground. A reporter in the press box looks at an angle of 18 degrees below the horizontal to see second base. What is the horizontal distance from the press box to second base.
The current in a 100 watt lightbulb is 0.800 A. The filament inside the bulb is 0.220 mm in diameter. What is the current density in the filament
A disk with mass m = 8.5 kg and radius R = 0.35 m begins at rest and accelerates uniformly for t = 18.8 s, to a final angular speed of ? = 28 rad/s. What is the moment of inertia of the disk?
A spherical mirror is to be used to fom an image 5 times as tall as the object on a screen positioned 1 meter from the mirror. Find the type of mirror
A spaceship is 1600 m long when it is at rest. When it is traveling at a certain constant speed its length is measured by external observers, What is the speed of the spaceship in terms of the speed of light
an 1800 kg car is moving at 14 m/s slows to 8.0 m/s in 4.4 s. Use the impulse momentum theorem to find the magnitude of the force on the car
A Simple Harmonic Oscillator consisting of a 305 g mass and a spring is set oscillating on a smooth flat surface. If the greatest speed of the mass is 1.50 m/s and the spring constant of the spring is 2.00 N/m.
The position of an object as a function of time is (3.2t + 1.8t^2)i + (1.7t + 2.4t^2) , where is the time in seconds. Find the magnitude and direction of the object.
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