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Q1. A planet of mass 4.00 1025 kg is in a circular orbit of radius 3.00 1011 m around a star. The star exerts a force on the planet of constant magnitude 2.08 1023 N. The speed of the planet is 3.95 104 m/s. What is the magnitude of change in momentum of the planet?
Q2. A block of mass 4.0 kg is put on top of a block of mass M = 5.5 kg. To cause the top block to slip on the bottom one, while the bottom one is held fixed, a horizontal force of at least 16 N must be applied to the top block. The assembly of blocks is now placed on a horizontal, frictionless table.
(a) Find magnitude of the maximum horizontal force F that can be applied to the lower block so that the blocks will move together.
(b) Find magnitude of the resulting acceleration of the blocks.
Like all stars, our sun converts mass into energy which radiates (spherically) in all directions, Calculate the rate at which the sun is losing mass
The Hall voltage across a conductor in a 42mT magnetic field is 1.9mu V. When used with the equal current in a different magnetic field, the voltage across the conductor is 2.7mu V.
A platinum resistance thermometer has resistances of 230.0 omegacap.gif when placed in a 0°C ice bath and 236.8 omegacap.gif, What is the melting point of this substance
The surface temperature of the start Betelgeuse is 3500K. Assume Betelgeuse radiates as a perfect blackbody. what is the energy of each of these photons
A ball is shot from the ground into the air. At a height of 8.6 m, the velocity is observed to be v = (8.1)i + (5.3)j in meters per second (i horizontal, j upward). To what maximum height will the ball rise
A charged sphere of radius 10 cm has a total charge of 5 C. Calculate the potential at the surface of the sphere
A student throws a baseball at a large gong 76 m away and hears the sound of the gong 1.95758 s later. What was the average speed of the base- ball on its way to the gong
Birds resting on high-voltage power lines are a common sight. The copper wire on which a bird stands is 2.5 cm in diameter and carries a current of 55 A. If the bird's feet are 3.9 cm apart, calculate the potential difference between its feet. (Th..
A speed skater goes around a turn that has a radius of 36 m. The skater has a speed of 12 m/s and experiences a centripetal force of 461 N
A 2.23-m-long rod, as measured in its rest frame, speeds by you longitudinally at 6.11 × 107 m/s. By how many millimeters do you determine the rod has contracted
Two point charges of equal magnitude are 7.3cm apart. At the midpoint of the line connecting them, their combined electric field has a magnitude of 40N/C . Find the magnitude of the charges.
After a plant or animal dies, its 14C content decreases with a half-life of 5730 years. what is the age of the ancient site
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