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A student standing on the ground throws a ball straight up. The ball leaves the student's hand with a speed of 9 m/s when the hand is 1.5 m above the ground. How long is the ball in the air before it hits the ground? (The student moves her hand out of the way.)
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A wall in a house contains a single window. The window consists of a single pane of glass whose area is 0.11 m2 and whose thickness is 8 mm. Treat the wall as a slab of the insulating material Styrofoam whose area and thickness are 15 m2 and 0.10 ..
A railroad car with a mass of 20,000 kg rolls into a second stationary car with a mass of 40,000 kg. How fast was the first car moving before the collision
The activity of a radioactive source decreases by 5.2% in 28 hours. What is the half-life of this source
In one cycle, a freezer uses 780J of electrical energy in order to remove 1730J of heat from its freezer compartment at 10.0 oF. What is the coefficient of performance of this freezer
A box of books weighing 327 N is shoved across the floor by a force of 471 N exerted downward at an angle of 35° below the horizontalIf μk between box and floor is 0.52, how long does it take to move the box 4.80 m starting from rest.
Two slits are illuminated by a 390 nm light.The angle between the zeroth-order bright band at the center of the screen, how far apart is this bright band from the central peak
You've been walking at a steady, and rope pulls up on the sled at a 21 angle. You estimate that the mass of the sled, with your friend on it, is 64 and that you're pulling with a force of 84.0.
When a switch is closed, the current in a wire is given as i(t)= 1.0Aexp(-.5t). How much charge will flow out if the switch is closed forever
you are to launch a rocket from just above the ground with one of the following initial velocity vectors 1 v initial
Compute the average linear velocity of the discus
A technician wraps wire around a tube of length 37 cm having a diameter of 8.2 cm. what is the self-induced emf in the solenoid
A 20.0 ?, 9.00 ?, and 9.00 ? resistor are connected in parallel to an emf source. A current of 6.00 A is in the 9.00 ? resistor. Calculate the equivalent resistance of the circuit
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