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An attacker at the base of a castle wall 3.62 m high throws a rock straight up with speed 6.90 m/s from a height of 1.24 m above the ground. (a) Will the rock reach the top of the wall? Yes or No (b) If so, what is its speed at the top? If not, what initial speed must it have to reach the top? m/s (c) Find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 7.90 m/s and moving between the same two points. m/s (d) Does the change in speed of the downward-moving rock agree with the magnitude of the speed change of the rock moving upward between the same elevations? Explain physically why it does or does not agree.
What mass (in grams) of steam at 100 C must be mixed with 175 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 50.0 C.
What is wavelength in meters of an electron
compute the force and the total work required in each case. Find the tension in each of the cables.
What was the angle of the hill. what is the current in the circuit when four lamps are turned on.
Speedboat A negotiates a curve whose radius is 118 m. Speedboat B negotiates a curve whose radius is 270 m. Each boat experiences the equivalent centripetal acceleration. What is the ratio vA/vB of the speeds of boats.
what is the magnitude of the charge on each sphere. A car crashes into a wall at 45 m/s and is brought to rest in 0.1 s. compute the average force exerted on a 80 kg test dummy by the seat belt.
Find out an angle of the velocity vector
What friction torque is necessary to reduce its angular speed from 90.0 {rm rpm} to 45.0 {rm rpm} in a time interval of 32.0 {rm s}.
compute your apparent weight at the top of a Ferris wheel, given that the radius of the wheel is 7.1 , it completes one revolution every 30 , and your mass is 51 .
A pilot flies an airplane at a constant speed of 520 km/hr in the vertical circle of radius 1400 m. compute the force exerted by the seat on the 105-kg pilot at point A and at point B.
An automobile tire has a radius of 0.330 m, and its centre moves forward with a linear speed of v= 15.0 m/s. Find the angular speed of the wheel.
State the condition that is necessary for a charge to move in a wire. Relate the definition of electric current to the units of current. Explain the cause of resistance and how the resistance of a wire can be determined.
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