8 The Atomic Theory has changed as scientists improved their understanding. Which incorrect
idea in Bohr's understanding of the atom was replaced by later theories? * M
(1 Point)
O
Atoms cannot be divided.
An atom is mostly empty space.
In an atom, electrons orbit the nucleus like planets orbit the sun.
O An atom includes electrons embedded in a sphere of positive charge.

Astring that is fixed at both ends has a length of 1.05 m. when the string vibrates at a frequency of 91.0 hz, a standing wave with five loops is formed. (a) what is the wavelength of the waves that travel on the string? (b) what is the speed of the waves? (c) what is the fundamental frequency of the string?

Aferris wheel is a vertical, circular amusement ride with radius 9 m. riders sit on seats that swivel to remain horizontal. the ferris wheel rotates at a constant rate, going around once in 9 s. consider a rider whose mass is 56 kg. at the bottom of the ride, what is the perpendicular component of the rate of change of the rider's momentum? at the bottom of the ride, what is the vector force exerted by the seat on the rider?

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is