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A 25g copper calorimeter contains 90g of water at 25 degrees Celsius. Into this is poured 50g of substance X, heated to 100 degrees Celsius. If the final temperature of the mixture is 45 degrees Celsius, what is the specific heat of substance X?
The focal length of the lens of a simple film camera is 40.0 mm. By what amount should the distance between the lens and the film
A space traveller whose mass is 104kg leaves earth. What are his weight and masson earth and in interplanetary space where there are no near planetary objects.
a wave travels along a string at a speed of 280 ms. what will be the speed if the string is replaced by one made of the
A rocket traveling at 0.540c sets out for the star, which is 5.45ly away from earth. It will return to earth immediately after reaching the star. According to the rocket crew how far will the rocket travel
A 10 kilogram lead ball is dropped from a height of 30 m and it hits the floor at a speed of 20 m/s. Find how much mechanical energy is lost to air resistance
The 1050.kg steel beam shown below is supported by two ropes. What is the tension in each rope
A 21.5 g bullet strikes a 0.650 kg block attached to a fixed horizontal spring whose spring stiffness constant is 7.30 x 10^3 N/m and sets it into vibration with an amplitude of 21.5 cm. What was the speed of bullet before impact if the bullet and bl..
In this problem two moles of an ideal gas at 400 K expand quasi-statically and isothermally from an initial volume of 49.0 L to a final volume of 83.0 L. What is the entropy change of the gas
What is the force of friction and its coefficient of friction if a 5 kg box slides on a horizontal plane when its speed decreases 1.5ms-1 in a second?
At the Earth's surface, a projectile is launched straight up at a speed of 9.1 km/s. To what height will it rise
When yellow sodium light, ?=589nm, falls on a diffraction grating, its first-order peak on a screen 55.0cm away falls 3.29cm from the central peak. What is the wavelength of the new source
An astronomical telescope is being utilized to examine a relatively close object that is only 109.00 m away from the objective of the telescope. The objective and eyepiece have focal lengths of 1.400 and 0.0920 m, correspondingly. Noting that the exp..
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