A roller coaster has a small vertical loop with the lowest point 5 meters above the ground. The initial elevation from which the cart was released is 62.5 m. What should be radius of that loop to make sure the vertical acceleration at the bottom point does not exceed 2g?

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

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