If a machine has 100% efficiency, it means that

A. output work is equal to input work.

B. output force is equal to input force.

C. output work is twice the input work.

D. output force is twice the input force.

A thin block of soft wood with a mass of 0.080 kg rests on a horizontal frictionless surface. A bullet with a mass of 4.67 g is fired with a speed of 599 m/s at a block of wood and passes completely through it.

In which situation does physical activity move beyond the baseline level? A) walking a short distance B) jogging C) sleeping D) completing basic chores

Which is NOT unique to each element? Select one: a. neutron number b. atomic number c. proton number d. chemical symbol

To lower the voltage from a "120 V" outlet, what is used (first, at least) in most situations A. resistor B. transformer C. capacitor D. diode

Obsidian is a volcanic glass that forms when lava cools very quickly and consists of a solid mass of glass through and through. Why is obsidian not classified as a mineral?

Which of the following do not involve a direction? Check all that apply. A. Time B. Velocity C. Distance D. Acceleration

What does deltaX mean in physics?

Which activity involves using fossil fuels directly or indirectly? 1) eating fresh fruit for a snack 2) cooking hot dogs on a campfire 3) using crayons to color 4) walking to school

Which of the following objects would have the most inertia? A. A sphere with a radius of 5 cm and a mass of 34 grams. B. A sphere with a radius of 4 cm and a mass of 15 grams. C. A sphere with a radius of 8 cm and a mass of 27 grams. D.

A boy slides a book across the floor using a force of five and over a distance of 2M what is the kinetic energy of the book after he slides at assume there is no friction