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A man pushes an 80N crate a distance of 5m upward along africtionless slope that makes an angle 30o withthe horizontal. The force he exerts is parallel to the slope. If the speed of the crate increases at a rate of1.5m/s2 how much work is done by the man.
A can of sardines is made to move along an x axis from x = 0.36 m to x = 1.40 m by a force with a magnitude given by F = exp(-4x), How much work is done on the can by the force
The gravitational acceleration on the surface of Mercury is 0.38 times that of Earth. What is the ratio of the density of Mars to that of Earth
A fisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. What is the amplitude A of each wave
A fire engine is driving directly away from a solid wall at 21 m/s on a hot C day while its siren emits a steady 500. Hz sound. What is the frequency of this reflected wave as heard by this firefighter
A spring whose spring constant is 750 N/m is compressed by 15 cm from. 10 kg ball. How high will the ball go in the air
On a cool morning, when the temperature is 11 ^circC, you measure the pressure in your car tires to be 30.0 psi. After driving 20 mi on the freeway, the temperature of your tires is 53 ^circC.
A flat coil of wire consisting of 20 turns, each with an area of 50 cm2, is positioned perpendicularly to a uniform magnetic field that increases its magnitude at a constant rate from 2.0 T to 6.0 T in 2.0 s. If the coil has a total resistance of ..
question a block of mass 5 kg lies on a horizontal table. the block is at rest. the only forces acting on the block are
A 13-µF capacitor and acapacitor of unknown capacitance are both charged to 2.90 kV. After charging, the two capacitors aredisconnected from the voltage source. The capacitors are then connected to each other--positive plate to negative plate andn..
On a touchdown attempt, a 95.0 kg running back runs toward the end zone at 3.75 m/s. What are the initial and final kinetic energies of the system
An inductor (L = 400 mH), a capacitor (C = 5.30 μF), a resistor(R = 500 Ω) are connected in series. A 50.0 Hz AC generator connected in series to these elements producesa maximum current of 300 mA in the circuit.
To prevent damage to floors (and to increase friction), a crutch will often have a rubber tip attached to its end. by what factor does the tip reduce the pressure exerted by the crutch
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