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A solid piece of aluminum "weighs" 57.6 g in air and 26.5 g when submerged in a liquid. (a) What is the volume of the metal piece? (b) What is the mass density of the liquid?
The construction of a flat rectangular roof (5.15 m × 7.44 m) allows it to withstand a maximum net outward force of of 2.33 × 104 N. At what wind speed will this roof blow outward
Suppose a 29.0-kg child sits 1.12 m to the left of center on the seesaw. A second child sits at the end on the opposite side, and the system is balanced. Find the normal force acting at the pivot point
A 6.4kg ball, hanging from the ceiling by a light wire 135cm long, is struck in an elastic collision by a 1.80 ball moving horizontally at 4.20 m/s just before the collision. Find the tension in the wire just after the collision.
In a specific heat experiment 210.0 grams of aluminum (C=913.0 J/kg.K) at 100.0°C) is mixed with 36.0 g water at 20.0°C. Find the entropy change of the water
if a 1500kg car is driven in sand at 5m/s, the coefficient of rolling friction is 0.06. What is the propulsion force need tot keep the car moving
A proton (mass 1.67 x 10^27kg) is moving at 1.55 x 10^6m/s directly toward a stationary helium nucleus (mass 6.64 x 10^27kg). what is the helium's velocity
A stone is tied to a string (length = 0.950m) and whirled in acircle at the same constant speed in two different ways. First, the circle is horizontal and the string is nearly parallelto the ground. Next, the circle is vertical.
Dirk pushes on a packing box with a horizontal force of 52.0 N as he slides it along the floor. How much total work is done on the box in moving it 3.20 m along the floor
A small motor is mounted on the axis of a space probe with its rotor (the rotating part of the motor) parallel to the axis of the probe. Through how many revolutions has the rotor turned
Suppose a crate of mass 8.4 kg is placed on the plank in the figure below at a distance x = 8.3 m from the left end. find the forces exerted by the two supports on the plank
Now suppose the friction is sufficient to keep the car from skidding. Compute the magnitude of the normal force exerted on the car by the road's surface.
If its length is 49.8 m when measured from inside the spacecraft, what is its length measured by a ground observer
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