Power: Rita raises a 10kg package to a height of 2.5 m in 2.0 s.(a) How much work did she do on the package?(b) How much power was expended on the package?(c) If she were to raise the package in 1.0 s rather than 2.0 s, how do the work and power change?
What will be an ideal response?
(a) 0.25 Kj (b) 0.12 kW (c) the same work, but the power doubles
You might also like to view...
I use a rope 1.00-m-long to swing a 1.00-kg weight around my head. The tension in the rope is 20.0 N. In half a revolution how much work is done by the rope on the weight?
a. 20.0 J b. 31.4 J c. 123 J d. 0
Why was it thought that Titan may have oceans of methane?
A) Titan's atmosphere contains traces of methane. Similarly, Earth's atmosphere contains traces of water vapor. So, scientist thought Titan should have methane oceans. B) The atmospheric pressure at Titan's surface and its surface temperature are such that methane should be liquid on Titan's surface. C) The abundance of hydrocarbons in the atmosphere of Titan, led scientists to believe that Titan had an abundance of methane on its surface. D) Titan's atmosphere is like Earth's (mostly nitrogen), but its temperature is too low for water to be in the liquid phase. The only other possible liquid was methane. E) Since Saturn has methane ice in its atmosphere, methane should be abundant in this region of the solar system. The sheer abundance of methane in the region led scientists to hypothesize methane oceans on Titan.
Particles made up of two quarks must consist of a quark-antiquark pair
Indicate whether the statement is true or false
A fan, electric heater, and lamp are connected in parallel across a 120-V line. The resistances are Rlamp = 148 ?, Rheater = 32 ?, and Rfan = 48 ?. What is the total current supplied to the circuit?
a. 17.0 A b. 7.06 A c. 0.526 A d. 1.90 A