Carlota does 2000 J of work on a machine. The machine does 500 J of work. What is the efficiency of the machine?

A. 4%

B. 25%

C. 75%

D. 400%

123,876.3 in scientific notation

Which is smallest: 9*6 or 8*7 or 5*11?

A 2.0cm3 air bubble is released from the sandy bottom of a warm, shallow sea, where the gauge pressure is 1.2atm. The bubble rises slowly enough that the air inside remains at the same constant temperature as the water.

Hemoglobin is a molecule found in blood used to transport oxygen throughout the body. What type of biological compound is this?

A 1.79 m long uniform rod with a mass of 2.03 kg is allowed to rotate. By pushing perpendicularly on the edge of the rod, a student produces an angular acceleration of 12.9 rad/s2.

Total energy input is 1400 and my efficiency is 80% so what is the useful energy output in jules?

What is the force of gravity acting on a 2000-kg spacecraft when it orbits two Earth radii from the Earth's center (that is a distance r=6380 km above the Earth's Surface. The mass of the Earth is 5.98 x 1024 kg.

An LC circuit has a 6.00 mH inductor. The current has its maximum value of 0.570 A at t = 0s. A short time later the capacitor reaches its maximum potential difference of 66.0 V. What is the value of the capacitance?

The first law of thermodynamics states that ΔE = Q - W. Is this also a statement of the principle of conservation of energy? Yes, the heat added and the change in internal energy of the gas equal the work done by the piston.

How can we calculate the density of a sustance that has irregular volume