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An attacker at the base of a castle wall 3.65 m high throws a rock straight up with speed 7.40 m/s at a height of 1.55 m above the ground.
(a) Will the rock reach the top of the wall?
(b) If so, what is the rock's speed at the top? If not, what initial speed must the rock have to reach the top?
(c) Find the change in the speed of a rock thrown straight down from the top of the wall at an initial speed of 7.40 m/s and moving between the same two points.
(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 or why not.
Suppose a cannonball is fired into the air with an initial velocity of 35.0 m/s at an angle 32? above the horizontal. Ignore the effects of air friction. How far from the cannon will the second "half" land
you have deployed drifting buoys in the pacific at 20o south. after the passage of a strong storm you observe your
In an L-R-C series circuit L=0.500 H, R=380.0 ohms, and C=7.50 microF. The voltage amplitude of the source is 250.0 V. Find the rms voltage across the capacitor
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An extreme distance runner is having an easy training day and runs 34 km west over 3 hours, Calculate his/her distance, displacement, speed and velocity for the entire training session
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A roof-top solar water heater collects 50% of the 200 W/m^2 provided by the sun, using absorbers with a total area of 30m^2. If water enters the system at 15(C), how many hours will be required to warm 150kg of water to 60(C) using this heater? (Y..
A 8.75-\mu {\rm C} point charge is glued down on a horizontalfrictionless table. What would the tension be if both charges were negative
A satellite of mass 190 kilogram is launched from a site on Earth's equator into an orbit at185 kilometer above the surface of Earth. Evaluate what is the satellite's speed in its orbit
a wheel is rotating at 33.3 rad/s is given an angular accelerationof 2.15rad/s2. Through what angle has the wheel turned when itsangular speed reaches 72.0 rad/s
An electric motor rotating a workshop grinding wheel at a rate of114 rev/min is switched off. Suppose the wheel has a constant negative angular acceleration of magnitude1.90 rad/s2. How long does it take for the grinding wheel to stop?
A 69 kg boy and a 40 kg girl use an elastic rope while engaged in a tug-of-war on an icy, frictionless surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find out the magnitude of the acceleration of the boy toward the girl.
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