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Two waves are traveling in the same direction along astretched string. Each has an amplitude of 4.0cm, assume the wavesare 45o out of phase. What is the amplitude of the resultant wave?
one point-like charge of -20 nc is placed 3 cm away from a very large planar sheet of charge. the surface charge
an automobile suspension involves both leaf springs with stiffness k and shock absorbers resist motion with a force
a recreational aircraft has a lift- off speed of 110 km/hr. If the aircraft has a constant acceleration of 5m/s^2, what minimum runway length does it need for take off
A satellite orbits the earth at a distance of 10,000 miles from the earth's center. At this distance the force of gravity on the satellite is 90 lbs. What would the force (in lbs) on the satellite be if the distance were 5,000 miles instead
define the initial velocity of the ball.
The expanding gases that leave the muzzle of a rifle also contribute to the recoil. A .30 caliber bullet has mass 7.20×10?3kg, Find the momentum of the propellant gases in a coordinate system attached to the earth as they leave the muzzle of the rifl..
A fisherman is fishing from a bridge and is using a "30.0-N test line." In other words, the line will sustain a maximum force of 30.0 N without breaking. What is the weight of the heaviest fish that can be pulled up vertically.
A satellite is in a circular orbit very close to the surface of a spherical planet. The period of the orbit is 2.54 hours. What is density of the planet
A 15 kg box is pulled horizontally by a 20 N force on a frictionless surface. What is the change in kinetic energy of the box
q1. a car accelerates from 17 m s1to 31 m s-1 with a uniform acceleration of 2.5 m s-2. calculate the displacement of
A 22 child slides down a 2.4 -high playground slide. She starts from rest, and her speed at the bottom is 1.9 What is the change in thermal energy of the seat of her pants
A heat engine operates in a Carnot cycle between72.0°C and345°C. It absorbs21,600J of energy per cycle from the hot reservoir. How much energy does it expel in each cycle by heat
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