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Influenced by the gravitational pull of a distant star, the velocity of an asteroid changes from from +19.0 km/s to -19.4 km/s over a period of 1.85 years.
(a) What is the total change in the asteroid's velocity? (Indicate the direction with the sign of your answer.)
(b) What is the asteroid's average acceleration during this interval
The electric field midway between two equal but opposite point charges is 713N/C, and the distance between the charges is 17.7cm. What is the magnitude of the charge on each
A 20.00kg sled is being pulled across a horzontal surface at a constant velocity. Determine the kinetic frictional force
The head of a 3.2 kilogram hammer, moving at 5.2 m/s, strikes a nail and drives it into hardwood. Compute the change in kinetic energy of the hammer
An average froghopper insect has a mass of 12.3 mg and reaches a maximum height of 290 mm when its takeoff angle is 58° above the horizontal. Discover the takeoff speed of the froghopper.
(a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 12.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mole. (b) Imagine adding electrons to the pin until the negative charge h..
a target plane flies at 2100 meters. an anti-craft gun fires a projectile with an initial upward velocity of 200
during high jump practice an athlete reached a maximum height of 3.03 m where the time to reach the apex was 0.58 s.
Three charged particles are placed at the corners of an equilateral triangle of side 1.20m. The charges are +7.0μC and -6.0μC. Compute the magnitude and direction of the net force on all due to the other two.
Two divers jump from a 5-m platform. One jumps upward at 1.90m/s , and the second steps off the platform as the first passes it on the way down. By how much does the first diver hit the water first (seconds)
A 1300kg car is going 50mph. Find the thermal energy created in the car's brakes when stopping the car. Express your answer to two significant figures and include the appropriate units.
A ball of mass m falls from height h,to height hf near the surface of the Earth, as shown at right. When the ball passes it has a speed vf. Ignore air resistance, and assume that any changes in kinetic energy of the Earth are negligible.
a thin metallic spherical shell of radius 42.1 cm has a total charge of 9.05 oc uniformly distributed on it. at the
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