Which of the following statements is true? friction moves in the same direction as motion some machines are 100 percent efficient. power measures the speed at which work is done. windmills change circular motion into straight motion.

Which type of wave can travel without a medium

Iwill give 30 points to whoever answers ! what is the formula for actual mechanical advantage and ideal mechanical advantage?

Which statement correctly describes the current in a circuit that is made up of any two resistors connected in parallel with a battery? a. the current in the battery and in each resistor is the same b. the current the battery equals to the sum of the currents in the resistors c. the current in the battery is less than the current in either resistor d. the current in the battery equals to the product of the currents in the resistors