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When light from your desk lamp passes through a 45-mm focal length lens, it forms a sharp real image on a sheet of paper located 45.25 mm from the lens. How far is the desk lamp from the lens?
Derive an equation for radius r of circular path that the electrons follow in terms of the magnetic field B, the electrons’ velocity v, charge e, and mass m. You may assume that the electrons move at right angles to the magnetic field.
A swimmer heads directly across a river, swimming at 1.60 m/s relative to the water. She arrives at a point 58.0 m downstream from the point directly across river, 63 m wide. What is the speed of the river current.
A turtle crawls along a straight line, which we will call the x-axis with the positive direction to the right. The equation for the turtle's position as a function of time is x(t) = 50.0 cm +(2.00 cm/s)t -(.0625 cm/s^2)t^2 At what time is the turt..
A 10 ball of clay traveling east at 9 collides and sticks together with a 40 ball of clay traveling north at 6.5. What is the speed of the ball of clay.
A 4.47 m long pole stands vertically in a lake having a depth of 2.22 m. while the sun is 62.6 degrees above the horizon, find the length of the pole's shadow on the bottom of the lake.
A small body of mass 0.13 kg is undergoing simple harmonic motion of amplitude 9.0 cm and period 0.10 s. What is the maximum value of the force acting on it? If the oscillations are produced by a spring, what is the spring constant?
The wheel of a car has a radius of 0.360 m. The engine of the car applies a torque of 327 N·m to this wheel, What is the magnitude of the static frictional force
If the coefficient of friction between the block and the floor is 0.40, what is the mass of the block.
A 44.20 cm diameter disk rotates with a constant angular acceleration of 2.84 rad/s2. It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.3° with the positive x-axis at t..
A 0.300kg block is moving to the right along a horizontal frictionless surface with a speed of 0.600 m/s. Find the final velocity of each block after the collision
A uniform electric field of magnitude 256 V/m is directed in the negative y direction. Through what potential difference did the charge move
A river steamboat travels 36 miles downstream in the same time that it travels 24 miles upstream. What is the currents speed
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