Determine whether or not there can be forces acting on an object that is at rest

A child on a 2.4 kg scooter at rest throws a 2.2 kg ball. The ball is given a speed of 3.1 m/s and the child and scooter move in the opposite directions at 0.45 m/s. Find the child's mass.

What is the speed of a wave if the wavelength is 3 meters and the frequency is 200 hertz

You have a device that needs a voltage reference of 3.0 V, but you have only a 9.0 V battery. Fortunately, you also have several 10 k!1 resistors.

What is the maxium amount of work that a 6000 watt motor can do in 10 seconds?

What organ absorbs excess water from undigested food prior to its release from the body as a solid waste

In what circumstance is displacement the same as distance traveled?

A team of dogs is pulling a sled with a net force of 2000 N. The sled is accelerating a 2.2 m/s^2. What is the mass of the sled?

Is the reduction of copper from copper (ii) oxide by carbon exothermic or endothermic? what is the sign of the energy change?

True or false we have mucus that covers are stomach which prevents or stomach acid from digesting or stomach

a man applies a force of 100n to a rock for 60 seconds but the rock does not move what is the amount of work done by the man on the rock