Sally is pushing a shopping cart with a force of 20 n. because the wheels are stuck, the friction caused by the ground is exerting a force of 8 n in the opposite direction. calculate the net force on the shopping cart including an arrow indicating what direction the shopping cart is going

A2.00-m long piano wire with a mass per unit length of 12.0 g/m is under a tension of 8.00 kn. what is the frequency of the fundamental mode of vibration of this wire?

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length (in m) of a column of water 1.45 km high for a temperature increase of 1.12°c. assume the column is not free to expand sideways. as a model of the ocean, that is a reasonable approximation, as only parts of the ocean very close to