A man accelerates a crate across a rough, level floor with an efficiency of 50%. Which is true? Group of answer choices

Energy is not conserved, because the efficiency is less than 100%.

Part of the man’s work goes into the kinetic energy of the crate, while the other part of his work is done against friction.

The energy gained by the crate equals the work done by the man.

The work done by the man equals the distance the crate moves multiplied by the friction.

Identical marbles are released from the same height on each of the following four frictionless ramps . compare the speed of the marbles at the end of each ramp. explain your reasoning

Give your knowledge of these things in your paper, you will compare and contrast analog and digital signals to determine which is more reliable for encoding and transmitting information. you’ll compare these features: signal shape numerical values for signal measurements amount of data that can be transmitted energy requirements privacy and security (ability of the signal to be encoded in a secret code) clarity of signal in the space provided, write down what you already know about any of these features. if you’re not sure, write down questions you might have about the features.

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.