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A small vertical mirror hangs on the wall, 1.20 m above the floor. Sunlight strikes themirror, and the reflected beam forms a spot on the floor 2.50 mfrom the wall. Later in the day, you notice that the spot has movedto a point 3.90 m from the wall. What was the change in the Sun's angle of elevation between your two observations?
Two particles of equal but unknown charge are held 45 cm apart. If their electrostatic repulsion is 2.2 X 10^5 Newtons, what is the magnitude of their charge
A hot air balloon is rising upward with a constant speed of 5 m/s. How high above the ground is the balloon when the compass hits the ground
A 40 kg girl, standing at rest on the ice, gives a 60 kg boy, who is also standing at rest on the ice, a shove, What is the girl's speed
A small thin coil with N2 loops, each of area A2, is placed inside a long solenoid, near its center. The solenoid has N1 loops in its length l and has area A1. Determine the mutual inductance as a function of ?, the angle between the plane of the s..
A loop antenna of area A = 794.0 cm2 and resistance R = 4.000 ? is perpendicular to a uniform magnetic field B = 2.000 T. Find the total thermal energy dissipated in the loop
an object when pushed with a net force f has an acceleration of 2 ms2. now twice the force is applied to an object that
A rock is thrown straight upward.it leaves the throwers hand at a height 1.5m above the surface of the earht with a speed 1.5m/s. what maximum height will the rock reach
A parallel plate capacitor consists of 2 square plates 19 cm per side spaced .55 mm apart with only air between them. What is the maximum energy that can stored by the capacitor
a 0.40kg ball is suspended from a spring with spring constant 12 N/m. what is its maximum speed while it oscillates
Calculate the efficiency of a fossil-fuel power plant that consumes 450 metric tons of coal each hour to produce useful work at the rate of 900 MW
Knowing the temperature at the surface of the Earth to be 72 F, find the temperature at the surface of Venus. ( show your work step by step.)
A sinusoidal electromagnetic wave having a magnetic field of amplitude 1.50uT and a wavelength of 430nm is traveling in the +x direction through empty space. What is the amplitude of the associated electric field
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