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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.
If the falcon has a mass of 400 g, and is diving straight downward at 20 m/s when he catches it, how fast is the falcon traveling afterwards, and in what direction?
The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 11-g nail
10g of lead (specific heat = 0.128 J/g C) at 100 C is placed on a glacier of ice at 0 C. How much ice melts
An emf is induced in a conducting loop of wire 1.17 meter long as its shape is changed from square to circular. Obtain the average magnitude of the induced emf
At t=0 a ball is thrown upward from the ground. Two seconds later, the ball hits the ground. Assume g=10m/s2. What is the maximum height of the ball. What is the initial velocity of the ball?
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An electron (q = 1.6 x 10-19 C) moves at 4.5 x 106 m/s in the + y direction through a uniform magnetic field with magnitude 6.2 T, Find the magnitude and direction of force on electron
A wheel of mass m = 16kg and radius r = 0:5m is connected to a motor that causes it to attain rotational speed of w = 20rads^-1 in 10s, What is the average torque applied to the wheel by the motor
A 2700-turn solenoid has a radius of 5.85 centimeter and a length of 17.3 centimeter. Determine the energy stored in it when the current is 0.740 Amp
750kg racecar took 3s to slow from 32m/s to 15m/s. What was the impluse? what was the average force applied to the brakes
A single conservative force = (4.0x - 12) N where x is in meters, acts on a particle moving along an x axis. The potential energy U associated with this force is assigned a value of 20 J at x = 0.
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