List two examples of ways to increase efficiency in a machine.

A crane with output power of 200W will lift a 600N object a vertical distance of 4.0 meters in seconds

The molecule that traps the sun's energy is?. a. ATP b. glyceraldehyde-3-phosphate c. chloroplast d. chlorophyll

Electric current flows through paths called circuits. People often build circuits using wires, resistors, and batteries. A battery is a voltage source.

A transformer has 500 primary turns and 9.7 secondary turns. (a) If Vp is 120 V (rms), what is Vs with an open circuit? (b) If the secondary now has a resistive load of 13 Ω, what is the current in the primary and secondary?

Where is the safest spot in the house during a tornado, hail storm, and earthquake? Include separate answers.

What is the simplest relationship between the angular wavenumber k and just one of the other kinematic variables? Express your answer using only one of the other kinematic variables plus constants like π.

The pilot of an airplane notes that the compass indicates heading west. The airplane's speed relative to the air is 100 km/h. The air is moving in a wind at 25.0 km/h toward the north.

How do you get a resultant factor? A. Add two or more vectors B. Add two scalars C. Multiply two scalars D. Multiply two vectors

A panpipe is made of five pipes. The longest pipe is 25 centimeters long and the shortest is 5 centimeters long. Which of these pipe produces the highest-frequency sound and why?

Model rocket A is launched at an angle of 70° above the x axis, with an initial velocity of 40 m/s. An identical rocket B is launched under the same conditions at an angle of 90° above the x axis, also with an initial velocity of 40 m/s.