Learn more about our help with Assignments: Physics
Search & Filtering
Physics
A householder uses panels of solar cells to generate electricity for his home. The solar cells are titled to receive the maximum energy input from the sun.
use the data in the table to describe how the average energy input to the solar cells depends on the angle of tilt.
A 200kg object and a 500kg object are separated by 4.00m Find
(a)the net gravitational force exerted by these objects on a 50.0 kg object placed midway between them.
(b) At position (other than an infinitely remote one) can the 50.0kg object be placed so as to experience a net force of zero from the other two objects?
(a)the net gravitational force exerted by these objects on a 50.0 kg object placed midway between them.
(b) At position (other than an infinitely remote one) can the 50.0kg object be placed so as to experience a net force of zero from the other two objects?
- A comet with a mass of 75,000 kg is moving with a velocity of 25,000 m/s. Calculate its kinetic energy.
A bullet after penetrating 3cm of a wall loses half of its speed. How far will the bullet penetrate the wall afterwards?
A satellite originally moves in a circular orbit of radius R around the Earth. Suppose it is moved into a circular orbit of radius 4R. What does the force exerted on the satellite then become?
(a) 8 times larger
(b) 4 times larger
(c) one-half as large
(d) one eighth as large
(a) 8 times larger
(b) 4 times larger
(c) one-half as large
(d) one eighth as large
An Object of mass m is located on the surface of a spherical planet of mass M and radius R. The escape speed from the planet does not depend on which of the following?
(a) M
(b) m
(c) the acceleration due to gravity on that planet
(d)R
(a) M
(b) m
(c) the acceleration due to gravity on that planet
(d)R
Physics
A 20kg box is pushed across a flat floor with a force of 50N, if the
coefficient of kinetic friction between the floor and box is u = 0.20, what is
the acceleration of the box across the floor?
2.5 m/s/s
O 1.25 m/s/s
O 0.5 m/s/s
O m/s/s
A satellite moves in a circular orbit at a constant speed around the Earth. Which of the following statements is true?
(a) No force acts on the satellite
(b) The satellite moves at a constant speed and hence doesn't accelerate.
(c) The satellite has an acceleration directed away from the Earth.
(d) The satellite has an acceleration directed toward the Earth.
(a) No force acts on the satellite
(b) The satellite moves at a constant speed and hence doesn't accelerate.
(c) The satellite has an acceleration directed away from the Earth.
(d) The satellite has an acceleration directed toward the Earth.
An electronic technician wishes to construct a parallel-plate capacitor using rutile (k = 100) as the dielectric. The area of the plates is 1.00cm^(2) . What is the capacitance if the rutile thickness is 1.00mm?
A parallel-plate capacitor is connected to a battery. What happens to the stored energy if the plate separation is doubled while the capacitor remains connected to the battery?
(a) Remains the same
(b) It is doubled
(c) It decreases by a factor of 2
(d) It decreases by a factor of 4
(a) Remains the same
(b) It is doubled
(c) It decreases by a factor of 2
(d) It decreases by a factor of 4
