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Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 16.0 m/s at an angle 27.0 degrees; with respect to the horizontal. Sarah catches the ball 1.5 meters above the ground. What is the time the ball is in the air?
A tiny sphere with a charge of q = +6.0 µC is attached to a spring. Two other tiny charged spheres, each with a charge of ?4.0-µC, are placed in the positions, in which b = 3.8 cm. The spring stretches 5.0 cm from its previous equilibrium position..
If an astronaut can throw a certain wrench 14 {rm m} vertically upward on earth, how high could he throw it on our moon if he gives it the similar starting speed in both places.
A 11m ×13m house is built on a 15cm -thick concrete slab. What is the heat-loss rate through the slab
In a section of horizontal pipe with a diameter of 3.00 cm the pressure is 5.21 kPa and water is flowing with a speed of 1.50 m/s. What is the pressure in the narrower region
Two charged bodies exert a force of .145N on each other. If they are now moved so they are one fourth as far apart, what force is exerted.
A tennis ball of mass m(t) is held just above a basketball of mass m(b), With their centers vertically aligned, both are released from rest at the same moment, To what height does the tennis ball rebound
A car of mass 1540 kg rests on a hydraulic lift with a piston of radius 0.27 m that is connected to a second piston of radius 0.031 m. what is the force at the second piston
A silicon solar cell looks like a battery with a 0.48V terminal voltage. what percentage of the energy incident on the cell is converted to electric energy
A flat coil of wire is used with an LC-tuned circuit as a receiving antenna. The coil has a radius of 0.35 m and consists of 480 turns. find the magnitude of the average emf induced in the antenna
A kite is hovering over the ground at the end of a straight 44-m line. The tension in the line has a magnitude of 15 N. Find the height of the kite
the pericarppart of a popcorn kernel is a small container of liquid water. when the poppcorn is heated to about 180 degrees C, what is the change in entropy of the water due to the vaporization and expansion
A rock weighing 8528 N rock with a volume of 24 L is completely submerged in mercury. The density of mercury is 13.6 kg/L. Determine the buoyant force on the rock
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