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Brewed coffee is often too hot to drink right away. You can cool it with an ice cube, but this dilutes it. Or you can buy a device that will cool your coffee without dilution - a 270g aluminum cylinder that you take from your freezer and place in a mug of hot coffee. If the cylinder is cooled to -20 C, a typical freezer temperature, and then dropped into a large cup of coffee (essentially water, with a mass of 500 g at 85 C, what is the final temperature of the coffee?
Explain how does that compare with the heat needed to reaise the temp of the same mass of water through the same temp difference?
when it is very far from the asteroid it will be traveling with speed 187 m/s. We have a large and powerful spring whose stiffness is 3.0 105 N/m. Explain how much must we compress the spring?
In a television picture tube, electrons strike the screen after being accelerated from rest through a potential difference of 20000 V. The speeds of the electrons are quite large.
A person with normal eyesight uses a converging lens of focal length 10 cm. At what distance from the job he must hold the lens
What is the rms speed of nitrogen molecules at a temperature of 55 oC? The mass of a nitrogen molecule is 4.680×10-26 kg
One-half mole of a monatomic ideal gas expands adiabatically and does 520 J of work. Specify whether the change is an increase or a decrease
What is the frequency of blue light that has a wavelength of 450 nm and What is the frequency of red light that has a wavelength of 650 nm
A rocket of mass 4.5 x10^5 kg is in flight. Its thrust is directed at an angle of 53° above the horizontal and has a magnitude of 6.80 x10^6 N. Find out the magnitude and direction of the rockets acceleration. Give the direction as an angle above ..
What is the resulting compressional force on the Earth. what is the acceleration of a rock at top of its trajectory when it has been thrown straight upward.
The leg and cast weigh 200 N, with the center of mass as indicated by the blue arrow. The counterbalance w1 weighs 110 N. find out the weight w2 and the angle α needed so that no force is exerted on the hip joint by the leg plus cast.
A box of mass 32 kg is at rest on a horizontal frictionless surface. A constant horizontal force then acts on the box, and accelerates it to the right. It is observed that it takes the box 6.5 seconds to travel 48 meters. What is the magnitude of for..
A hoop and a disk, both of 0.46- m radius and 3.0- kg mass, are released from the top of an inclined plane 3.2 m high and 7.0 m long. What is the speed of the hoop
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