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(a) The distance to a star is approximately 4.2e18 m. If this star were to burn out today, in how many years would we see it disappear?
___ years
(b) How long does it take for sunlight to reach Jupiter?
___ minutes
(c) How long does it take for a microwave radar signal to travel from Earth to the moon and back?
___ seconds
(d) How long does it take for a radio wave to travel once around the earth in a great circle, close to the planet's surface?
(e) How long does it take for light to reach you from a lightning stroke 10.0 km away?
One billiard ball is shot east at 3.0 m/s. A second, identical billiard ball is shot west at 1.0 m/s. What are the speed and direction of the first ball after the collision
Question: Field and force with three charges? What is the electric field at the location of Q1, due to Q 2 ?
You push a 2.7 kg box with a force of 23.8 N along a level floor, but a frictional force of 3.3 N opposes the motion
Inside a helium nucleus there are two protons, each of charge +e. Calculate the strengths of the electrostatic repulsive force and the gravitational attractive force between the two protons
Three uniform spheres are located at the corners of an equilateral triangle. Each side of the triangle has a length of 1.00 m. compute the magnitude of the initial acceleration of the third sphere
A proton is released from rest inside a region of constant, uniform electric field E1 pointing due North. 27.3 seconds after it is released, What is the ratio of the magnitude of E2 to the magnitude of E1
At the instant the traffic light turns green, a car that has been waiting at an intersection starts forward with a constant acceleration of 2.45 m/s2. How fast is the car traveling when it overtakes the truck
Imagine a figure that shows a system of two masses connected by a string. As m falls a distance h, M accelerates up the plane. What is the work done by friction on the system
a 85-kg sprinter accelerates from rest to a speed of 10.0 m/s in a 5.0 s. calculate the average power the sprinter must generate
A scaffold that weighs 275N supports two painters, one weighing 150N and the other weighing 325N, What should the reading on the right scale be
hear the sound of it hitting ground at the foot of the cliff. Ignoring air resistance, how high is the cliff if the speed of sound is 330 {rm m/s}.
American football uses a field that is 100.0 yd long, whereas a soccer field is 100.0 m long. Which field is longer, and by how much
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