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A picture is supported by two cords, each making an angle 53o with the horizontal. If the tension in each cord is 10 Newton.
(a) Calculate the weight of the picture?
(b) Could a picture be supported by two horizontal cords?
A huge cannon is assembled on an airless planet. The planet has a radius of 6.00×106 m and a mass of 2.09×1024 kg. What height does the projectile reach above the surface
The human eye can barely detect a star whose intensity at the earth's surface is 1.6*10^-11. how many photons per second enter the eye from the star
A 70.0 kg football player leaps straight up into the air (with no horizontal velocity) to catch a pass. how fast was the ball travelling
The surfer in the photo is catching a wave. Suppose she starts at the top of the wave with a speed of 1.50 m/s, how much work is done by the (non-conservative) force of the wave
Assume that a planet was reported to be orbiting the sun-like star Iota Horologii with a period of 300 days. Determine the radius of the planet's orbit
A car traveling at 22.0 m/sundergoes a constant deceleration of 1.90 m/s2when the brakes are applied. How many revolutions does each tire make
A converging lens can be used as a lighter (on a sunny day). If you want to use it to light a match, where should you put the match, What is the radius of the mirror
a flat sheet ofcrown glasshas a thickness of 2.2 cm. it is on top of a flat sheet of crystalline quartz that has a
The beam current in a color TV tube is 1.9 rnA. The beam cross section is circular with radius 0.5 mm. What is the current density
How much time elapses before the geologists hears the sound from the eruption? Discuss what we are assuming about the propagation of the wave. How much time does it take the seismic waves produced by the eruption to reach the geologist’s camp, ass..
a 75 kg man jumps from an airplane. when his parachute deploys it exerts a 500 n force on the man at an angle of 30
On a warm summer day (29?C), it takes 4.50s for an echo to return from a cliff across a lake. What is the temperature on the winter day
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