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A (hypothetical) large slingshot is stretched 1.2 m to launch a 170 g projectile with speed sufficient to escape from Earth (11.2 km/s). Assume the elastic bands of the slingshot obey Hooke's law.
(a) What is the spring constant of the device, if all the elastic potential energy is converted to kinetic energy?
(b) Assume that an average person can exert a force of 220 N. How many people are required to stretch the elastic bands?
An electric motor contains a 250-turn circular coil 5.8cm in diameter. If it is to develop a maximum torque of 1.6Nm at a current of 4.0 A, what should be the magnetic field strength
Consider a swinging pendulum with length l= 10 cm, a mass of 1 gm swinging at the end of it with an amplitude, Calculate the total energy ( potential plus kinetic) in ergs of the swinging pendulum
Water (density 1000 kg/m^3) is flowing in a pipeline. At point 1 the water velocity is 5.0 m/s. Point 2 is 3.5 m above point 1. The cross sectional area of the pipe is .060 m^2 at point 1 and .020 m^2 at point 2. What is the Pressure difference P1-P2..
On planet X, the alien residents use a temperature scale in which they define 0 degrees X to be the melting point of nitrogen and 100 degrees X to be the boiling point of nitrogen.
A helium-neon laser of = 633 illuminates a diffraction grating. The distance between the two m= 1 bright fringes is 36.0 cm on a screen 2.40 m behind the grating. What is the spacing between slits of the grating
you are a fighter pilot in your jet. you are moving at 1000 km/h when you go into a climb in order to avoid a HUGE UFO. What is the radius of the circular arc
Two conductors are joined by a long copper wire. Thus A) each conductor must be at the same potential. B) no free charge can be present on either conductor. C) each conductor carries the same free charge.
A 671-kg cannon fires a 18.5-kg projectile with a speed of 273 m/s with respect to the muzzle. what is the speed of the projectile with respect to the ground
The most intense beam of light that can propagate through dry air must have an electric filed whose amplitude is no greater than the breakdown value of Eair max= 3.0*10^6 V/m, CALCULATE THE MAXIMUM AMPLITUDE OF THE MAGNITIC FILED
The displacement of a wave traveling in the positive x-direction is D(x,t)=(3.5cm)sin(2.7x?122t), where xis in m and t is in s. What is the frequency of this wave
question1a space station is in the shape of a hollow ring 450 in diameter. at how many revolutions per minute must it
A destroyer sends a sonar pulse out to detect a submarine directly below the ship in the ocean. If the speed of sound in what is 1517 m/s and it takes 64.13 s for the return pulse to hit the hydrophone on the bottom of the ship, how deep is the su..
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