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A hot-air balloon is rising upward with a constant speed of 2.50m/s. when the balloon is 3.00 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much time elapses before the compass hits the ground?
The density of water in Earth's hydrosphere and the density of rocks in the crust are both lower than the average density of the planet as a whole
400 L of water is at 4 oC. If it took a heat 600 seconds to heat this up to 6 oC, what is the power rating of the heater
A 27.0-kg child on a 3.00-m-long swing is released from rest when the ropes of the swing make an angle of 35.0° with the vertical, Neglecting friction, find the child's speed at the lowest position
A femur is a bone in the leg whose minimum cross sectional area is about 4.0 x 10^-4 m^2. Find the maximum stress that this bone can withstand
A concave mirror produces a virtual image that is seven times as tall as the object. What is the focal length of this mirror
Two rooms in your house differ in temperature by 8.5?F. What's the temperature difference in kelvin
A crate of mass 10.2 kg is pulled up a rough incline with an initial speed of 1.60 m/s. What is the change in kinetic energy of the crate
A performer, seated on a trapeze, is swinging back and forth with a period of 9.95 s. what will be the new period of the system
A 45cm radius insulated sphere is charged so that the volume charged density is a function of the radius: Charge denisty=(34microC/m^4)r. Integrate to determine the total charge on the sphere.
A baseball pitcher can throw a ball with a speed of 70m/s. He is in the back of a pickup truck that is driving away from you. He throws the ball in the direction, and it floats toward you at a lazy 10 m/s.
Two objects attract each other gravitationally with a force of 2.5×10-10 while they are 0.60 apart. Their total mass is 5.0. Find out their individual masses.
A steel wire of length 1.97m with circular cross section must stretch no more than 0.270cm, What minimum diameter dmin is required for the wire
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