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A skateboarder, starting from rest, rolls down a 13.7-m ramp. When she arrives at the bottom of the ramp her speed is 6.28 m/s. (a) Determine the magnitude of her acceleration, assumed to be constant. (b) If the ramp is inclined at 33.3 ° with respect to the ground, what is the component of her acceleration that is parallel to the ground?
A proton and an electron are both accelerated through a potential difference of 7200V. What is the velocity of each particle
Four particles are held in place at the corners of a square with sides of length L. Each particle has a charge q and mass m. (a) What is the potential energy of the system of charges.
An airplane flies eastward and accelerates uniformly. At one position along its path it has a velocity of 33.3 m/s. Find the airplane\'s acceleration
A solid cube of iron (density = 7.87 g/cm3) has a mass of 88.0 g. What is the resistance between opposite faces of the cube
If it has a mass of 14.0 g, what is the minimum current (in Amperes) through the wire that would cause a magnetic force equal to its weight
The radius of Mars about one half that of Earth, and its mass is about 1/10. Using this information, estimate the acceleration due to gravity near the surface of Mars in m/s2
A jeweler working awith a heated 47 g gold ring must lower the ring's temperature to make it safe to handle. If the ring is initially at 99 C, what mass of water at 25 C is needed to lower the rings temperature to 38 c.
Calculate the ratio of the drag force on a jet flying at 1132 km/h at an altitude of 10.0 km to the drag force on a prop-driven transport flying at 547 km/h
A horizontal pipe contains water at a pressure of 100kPa flowing with a speed of 2.0m/s . The pipe narrows to one-half its original diameter. What is the speed of the water
Daisy throws a rock horizontally with a speed of 12 m/s from a bridge. It falls 2.28 s before reaching the water below. When the rock hits the water it is traveling with what horizontal component of the velocity.
The beam emerging from a ruby laser (wavelength 694.3 nm) passes through a circular aperture 6.2 mm in diameter. what is the angular spread of the beam
A constant force of magnitude 30 N makes an angle of 150° (measured counterclockwise) with the direction of increasing x as the force acts on a 2 kg object. How much work is done on the object by the force
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