A ball thrown upwards reaches a maximum height and then comes back down to the original level. As the ball is going downwards the velocity and acceleration both point down
Indicate whether the statement is true or false
T
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A machine gear consists of 0.14 kg of iron and 0.19 kg of copper. How much total heat is generated in the part if its temperature increases by 35.0 C°? (Specific heats of iron and copper are 450 and 390 J/kg/°C, respectively.)
a. 4.5E+3 J b. 4.8E+3 J c. 5.2E+3 J d. 2.2E+3 J e. 2.6E+3 J
Evidence that the recent rise in carbon dioxide concentration is due to human activity and not natural factors comes from
A) the amount of the rise in the atmospheric concentration tracks almost perfectly with the amount of carbon dioxide being released by industry B) estimates of changes in the amount of carbon dioxide from natural sources such as volcanoes and the oceans can account for no more than about 1% of the rise in the atmospheric concentration C) the ratio of carbon isotopes is consistent with the increase in carbon dioxide levels coming primarily from the burning of fossil fuels D) all of these constitute evidence
Although perpetual motion is the natural order of things in the universe
A) it follows that machines can operate and do work by perpetual motion. B) no perpetual-motion device that multiplies energy exists. C) both of these are false statements
If the 5th order minimum in the diffraction pattern is at 40°, at what angle is the 1st order minimum?
A) 8.0° B) 3.4° C) 4.0° D) 7.4° E) 1.7°