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An energetic father stands at the summit of a conical hill as he spins his 21 child around on a 5.1 cart with a 2.1--long rope. The sides of the hill are inclined at 25 . He keeps the rope parallel to the ground, and friction is negligible. What rope tension will allow the cart to spin with the 13 ?
What will be the equilibrium temperature when a 223 g block of copper at 258 C is placed in the 178 g aluminium calorimeter cup containing 874 g of water at 13.2 C.
Two insulated spheres have radii r1 and r2, and charges q1 and q2, What is their combined kinetic energy when they collide, in terms of the variables above, and k the constant in Coulombs Law
A block of mass m = 2 kg and initial velocity v = 5 m/s runs into and compresses a spring of spring constant k = 50 N/m. How long is the block in contact with the spring
A flight attendant pulls her 71 N flight bag a distance of 322 m along a level airport floor at a constant velocity. The force she exerts is 36 N at an angle of 53° above the horizontal.
A skydiver is falling downward through the air. He weighs 241.5 pounds. There is an upward force of air friction opposing his fall. What is the upward force of air friction
As you ride in the Ferris wheel, your apparent weight is different at the top than at the bottom. How many seconds does it take to complete one revolution
6.00g of nitrogen gas at 22.0 degree celsius and an initial pressure of 4.00atm undergo an isobaric expansion until the volume has tripled, What amount of heat energy is transferred from the gas as its pressure decreases
If the transformer is connected the wrong way around the circuit, what voltage is supplied to the doorbell
Sam, whose mass is 74 kg, straps on his skis and starts down a 67-m-high, 20 ^\circ frictionless slope. Find Sam's speed at the bottom using work and energy
A bullet with mass 5.18 g is fired horizontally into a 1.915-kg block attached to a horizontal spring. The spring has a constant 6.21 102 N/m, Find the initial speed of the bullet-block system
A spherically symmetric object with a density of 1.57g/cm3 and a radius of 16.5cm is falling. Assuming is has a drag coefficient of 378g/s, what is the magnitude of terminal velocity
A Na+ ion moves from inside a cell, where the electric potential is -68 mV, to outside the cell, Does its energy increase or decrease
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