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1. A 7.80-g bullet moving at 575 m/s strikes the hand of a superhero, causing the hand to move 5.50 cm in the direction of the bullet's velocity before stopping. (a) Use work and energy considerations to find the average force that stops the bullet. (b) Assuming the force is constant, determine how much time elapses between the moment the bullet strikes the hand and the moment it stops moving.
2. A 400-N child is in a swing that is attached to a pair of ropes 2.00 m long. Find the gravitational potential energy of the child-Earth system relative to the child's lowest position when (a) the ropes are horizontal, (b) the ropes make a 30.0° angle with the vertical, and (c) the child is at the bottom of the circular arc.
3. The potential energy of a system of two particles separated by a distance r is given by U(r) = A/r, where A is a constant. Find the radial force rightwards arrow above F sub r that each particle exerts on the other.
A block of mass 0.14 kg is placed on a vertical spring of constant 5723 N/m and pushed downward, compressing the spring 0.08 m. What height above the point of release will the block reach
if the surface temperature of the skin is taken to be how much thermal power does the body described in the
The figure below shows a circuit with a battery and 3resistors. The resistors have values of 4 Ω, 3Ω and6Ω as shown. The battery is 18 V. Calculate the equivalent resistance of the combination of resistors and the current in each resistor, the cu..
two stationary positive point charges charge 1 of magnitude 3.25nc and charge 2 of magnitude 1.60nc are separated by a
a student finds the following values from a graph between m and x in the static method of determining the spring
A spring is oscillating with a frequency of 1.7Hz. 3.9 seconds after the spring is released it is -20cm from equilibrium. Find the amplitude of the spring
A fireman tosses his 0.85-kg hat onto a peg, where it oscillates as a physical pendulum, find the moment of inertia of the hat about the pivot point
The fundamental physical constant of quantum mechanics, h, has played an important role in each of the three theoretical advances (those relating to the blackbody spectrum, the photoelectric effect, and the structure of the H atom).
A 5.0 kg object is moving to the right at 4 m/s and collides with another object of mass 10 kg moving to the left at 5 m/s. Find the momentum of the combined object
In a non-conducting region, voltmeter measurements show that the potential has a spherical symmetry, Find the differential volume in the annulus between rand r + dr
A crude model of the human vocal tract treats it as a pipe closed at one end.Find the effective length of the vocal tract in a person whose fundamental tone is 550Hz . Sound speed in air at body temperature is 354 m/s.
a 100-kg mass is pulled along a frictionless surface by a force f such that its acceleration is 6 ms2. a 20-kg mass
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