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Superman leaps in front of Lois Lane to save her from a volley of bullets. In a 1-minute interval, an automatic weapon fires 148 bullets, each of mass 8.0 g, at 350 m/s. The bullets strike his mighty chest, which has an area of 0.72 m2. Find the average force exerted on Superman's chest if the bullets bounce back after an elastic, head-on collision.
A luminous object is 3.60m from a wall. You are to use a concave mirror to project an image of the object on the wall, How far should the mirror be from the wall
A converging lens with a focal length of 20cm and a diverging lens with a focal length of -52cm are 92.0cm apart. Calculate the distance between image and diverging lens
Estimate the average force exerted by a shot-putter on a 7.0-kg shot if the shot is moved through a distance of 2.4m
A 5.00-kW motor is used to pull a 20.0-kg crate up a 15.0°-incline of length 4.00 m. At what average velocity can the motor move the crate up the incline
Steam is expanded from 12.5 MPa and 900 degrees Celsius to 0.30 MPa, 400 degrees Celsius in an adiabatic turbine. Determine the isentropic efficiency of this turbine
Identical point charges of +3.6 ?C are fixed to diagonally opposite corners of a square. Find the sign and magnitude of the third charge
A simple pendulum has a length of 0.70 m and a mass of 0.75 kg. Calculate the quantum number for the pendulum
Two boxes are connected by a cord running over a pulley, Calculate the tension in the cord and Calculate the acceleration of the system
Unpolarized light of intensity 1.1 W/m^2 is incident on a polarizer. what is the intensity of the light that leaves the analyzer
An object is placed in front of a converging lens in such a position that the lens (f = 14.0 cm) creates a real image located 28.0 cm from the lens. What is the image distance of this new image
A 5-kg object moving with a velocity of 4m/s colides head on with a 10-kg object moving towards it at -3m/s. If the 10-kg object stops dead after the collision, what is the approximate coefficient of restitution for this collision
Consider a balloon being filled up with oxygen. You have approximately 30 moles of oxygen gas in this balloon with volume 1.3 m^3. compute the temperature of the molecules
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