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Q. A package is dropped from a helicopter that is 28.0 m above the ground and flying straight upward at 8.02 m/s. Ignore air resistance. Find the maximum height above the ground reached by the package.
Q. A solid uniform 54.8 kg ball of diameter 38.0 cm is supported against a vertical frictionless wall using a thin 30.0 cm wire of negligible mass. Make a free-body diagram for the ball and use it to find the tension in the wire.
What minimum heat is needed to bring 230g of water at 20 degrees C to the boiling point and completely boil it away.
A high-speed flywheel in a motor is spinning at 450 rpm when a power failure suddenly occurs. The flywheel has mass 37.0kg and diameter 71 cm. The power is off for 27.0s and during this time the flywheel slows due to friction in its axle bearings...
A cluster of galaxies has a radius of about 5.2 million light-years (4.9×10^22) and an intracluster medium with a temperature of (6.5×10^7) K. Estimate the mass of the cluster. Give the answer in both kilograms and solar masses. Suppose combined l..
An electron with the initial speed of 4.00×10^5 is brought to rest by an electric field. What was the initial kinetic energy of electron, in electron volts.
What is the change in entropy for the system. How much force must be applied to climb the hill at the same speed and same air resistance.
find the angular displacement of the propeller.
On an amusement park ride, passengers are seated in the horizontal circle of radius 6.5 m. The seats begin from rest and are uniformly accelerated for 24 seconds to a maximum rotational speed of 1.4 rad/s.
A ship sets out to sail to a point 136 km due north. An unexpected storm blows the ship to a point 108 km due east of its starting point. How far must it now sail to reach its original destination.
A 92 kg man standing on a surface of negligible friction shoves a 73 g stone lying at his feet, giving it a velocity of 4.0 m/s. What velocity does the man acquire as a result.
What is the size of the gravitational force that the Earth exerts on the Moon.
A beam of light enters the fiber from air at an angle theta1 with respect to the normal. What is theta1 if light strikes the core-cladding interface at critical angle theta c.
A hot air balloon is rising straight up with a speed of 6.0 m/s. A ballast bag is released from rest relative to the balloon when it is 9.54 m above the ground. How much time elapses before the ballast bag hits ground.
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