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A spacecraft is in orbit around a planet. The radius of the orbit is 3.2 times the radius of the planet (which is R = 71454 km). The gravitational field at the surface of the planet is 24 N/kg. What is the period of the spacecraft's orbit? [Hint: You don't need any more data about the planet to solve the problem.]
Refrigerant-134a enters a compressor at 180 kPa as a saturated vapour with a flow rate of 0.35 m3/min and leaves at 700 kPa. The power supplied to the refrigerant during compression process is 2.35 kW. What is the temperature R-134a at the exit of th..
One of the weapons considered for the "Star Wars" antimissile system is a laser that could destroy ballistic missiles. When a high-power laser is used in the Earth's atmosphere, the electric field can ionize the air, turning it into a conducting p..
A nuclear power plant produces an average of 4.90 × 103 MW of power during a year of operation. Find the corresponding change in mass of reactor fuel
A car is traveling at 43.2km/hr on a flat, concrete highway. If the brakes are applied such that skidding occurs, the kinetic coefficient of friction between the road and tires is 0.808. If anti-lock brakes are properly applied after that no skidd..
What is the direction of the object's acceleration after it is free. What is the magnitude of the objects acceleration.
What is the focal length of the contact lenses that will enable him to see distant objects clearly
What is the sound intensity level. One on an Incline--One Hanging A block of mass mA = 4.50 kg on a frictionless inclined plane of angle 30.0° is connected by a cord over a massless, frictionless pulley to the second block of mass mB = 2.80 kg ha..
Given that 12g of carbon combines with 16g of oxygen to form carbon monixide, how various grams of carbon monoxide can be made from 48g of carbon and 48g oxygen.
Imagine a frictionless pulley (a solid cylinder) of unknown mass M and radius r = 0.200 m which is used to draw water from a well. A bucket of mass m = 1.50 kg is attached to a massless cord wrapped around pulley. The bucket starts from rest at th..
A child loses his balloon, which rises slowly into the sky. If the balloon is 23 cm in diameter as the child loses it, what is its diameter at the following altitudes? Assume that the balloon is very flexible and so surface tension could be neglec..
Lightning As a crude model for lightning, consider the ground to be one plate of a parallel-plate capacitor and a cloud at an altitude of 680m to be the other plate.
find the minimum thickness for constructive interference of visible light with a wavelength of 595 nm.
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