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A single resistor is connected across the terminals of a battery. Which one or more of the following changes in voltage and current leaves unchanged the electric power dissipated in the resistor?
(A) Doubling the voltage and reducing the current by a factor of two.
(B) Doubling the voltage and increasing the resistance by a factor of four.
(C) Doubling the current and reducing the resistance by a factor of four.
During a walk on the Moon, an astronaunt accidentally drops his camara over a 20.0m cliff. It leaves his hands with zero speed, and after 2.0s it has attained a velocity of 3.3 m/s downward. How far has the camera fallen after 4.0 s?
question an electron moving with a velocity v 5.0 times 107 ms i enters a region of space where perpendicular electric
A water balloon slingshot launches its projectiles essentially from ground level at a speed of 25.0m/s, For how many seconds will the balloon be in the air
In a 30.0 s interval, 540 hailstones strike a glass window of area 0.600 m2 at an angle of 45.0° to the window surface. Find the pressure on the window
A communications satellite is a solid cylinder with mass 1135 kg, diameter 0.91 m, and length 1.75 m. Calculate the satellite's rotational kinetic energy about the rotation axis
a double- slit interference experiment is performed with two very narrow slits separated by 0.15 mm. what is the distance between two nearby bright fringes on the screen
A sled weighing 200 N is held in place by static friction on a 15? incline, What is the coefficient of static friction between the sled and the incline
A radar station locates a sinking ship at range 18.1 km and bearing 136° clockwise from north. How far apart are the plane and ship
A 2inx4inx8ft is leaning against the wall, draw afree-body diagram of forces on it. what would be the minimum angle of the wooden bar with the floor
A typical photovoltaic cell delivers 4.0×10?3W of electric energy when illuminated with 0.11W of light energy. What is the efficiency of the cell
A bird stands on a dc electric transmission line carrying 2800 A. find the potential difference between the bird's feet
The period of the moon (the time for a complete revolution) is 27.32 days, Determine the angular velocity of the moon
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