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An astronaut lands on an earth-like planets and drops a small lead with a mass of 76.5 g from the top of the spaceship. the point of release is 18 m above the surface of the planet and the ball takes 2.5 s to reach the ground. the astronaut's mass on earth is 68.5 kg. what is her weight on the planet?
Typically, a tennis ball hit during a serve travels away at about 47 m/s. what is the magnitude of the change in its momentum (in kg*m/s) on leaving the racket
A 0.46 kg block slides across a tabletop with initial velocity of 3.1 m/s, Find the average friction force that retarded its motion
An electron and a positron have masses of 9.11 10-31 kg. They collide and both vanish, What is the energy of the electromagnetic radiation
Explain how much work is used to raise A to height h? What happens to the kinetic energy of B if its speed is doubled?
A 80 kg man is ice-skating due north with a velocity of 6.0 m/s when he collides with a 35 kg child. What is the direction of the child's velocity just before the collision
Two force vectors point in opposite directions and have the same magnitude. If their magnitudes are 36.5 Newton’s, then what is the magnitude of their sum?
How does the intensity change as position increases? What is the position value corresponding to the highest light intensity, What is the relationship between light intensity and position
A 57.5 kg skateboarder starts out with a speed of 1.75 m/s. He does +80.0 J of work on himself by pushing with his feet against the ground. How much has the vertical height of the skater changed
Determine the angular momentum of the Earth about its rotation axis (assume the Earth is a uniform sphere)
A tank contains mercury, whose density is 13,600 kg/m^3. Find the force exerted by the mercury on a circular plug
In order to study the long-term effects of weightlessness, astronauts in space must be weighed (or at least "massed"). Find the mass of the astronaut
A spherical shell 28 in diameter carries a total charge of 81 distributed uniformly over its surface. A 4 point charge is located at the center of the shell. What is the electric field strength 8 from the center.
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