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Let P be the total petroleum reservoir on Earth in the year t. (In other words, P represents the total quantity of petroleum, including what's not yet discovered, on Earth at time t.) Assume that no new petroleum is being made and that P is measured in barrels. What are the units of dP/dt? What is the meaning of dP/dt? What is its sign? How would you set about estimating this derivative in practice? What would you need to know to make such an estimate?
A transformer has 280 turns in the primary and 110 turns in the secondary. by what factor does it change the voltage
Two snowballs are moving directly toward each other along a vertical axis. Just before the snowballs collide, Draw a before and after picture of the collision
A spherical mirror is polished on both sides. When the convexside is used as a mirror, the magnification is +1/4. What is the magnification when the concave side is used as a mirror, the object remaining the same distance from the mirror?
A 250-g ball collides with a wall. The ball's velocity and the force exerted on the ball by the wall. What is v_{{rm{f}}x}, ball's rebound velocity.
what is the ratio of the electric force holding an electron in an assumed circular orbit around a hydrogen nucleus
A 0.339 kilogram pendulum bob passes through the lowest part of its path at a speed of 2.70 m/s. Determine the tension in the pendulum cable at this point if the pendulum is 72.0 centimeter long
A family ice show is held at an enclosed arena. The skaters perform to music with level 85.0 dB. What is the combined sound level
A frictionless pulley has the shape of a uniform solid disk of mass 2.80kg and radius 10 cm. What percent of the total kinetic energy does the pulley have
The side-view mirror of an automobile has a radius of curvature of 15.0 cm. How far is the object from the mirror
Two trains are traveling toward each other in still air at 27.6 m/s relative to the ground. One train is blowing a whistle at 330 Hz. The speed of sound is 343 m/s.
A cylindrical fishing reel has a moment of inertia of I = 6.61E-4 kg*m2 and a radius of 3.98 cm. A friction clutch in the reel exerts a restraining torque of 1.47 N*m if a fish pulls on the line. What is the force of the fish on the line
A coin 1 cm in diameter is embedded in a solid glass ball of radius 20cm. Find the position of the image of the coin and the height of the coin's image
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