a girl performed 50j of work lifting a heavy box it took her 5 seconds to lift the box what is her power

The cable lifting an elevator is wrapped around a 1.2-m-diameter cylinder that is turned by the elevator's motor. The elevator is moving upward at a speed of 2.7m/s. It then slows to a stop, while the cylinder turns one complete revolution.

How do informal and formal learning differ? One is more structured than the other. One requires less effort. One has less significance than the other. One is the best way to learn.

Each metal is illuminated with 400 nm (3.10 eV) light. Rank the metals on the basis of the maximum kinetic energy of the emitted electrons. (If no electrons are emitted from a metal, the maximum kinetic energy is zero, so rank that metal as smallest.

Which of these is most likely to be attracted to a magnet? A. a book B. staple C. stone D. eraser

A 2.3 kg, 20-cm-diameter turntable rotates at 100 rpm on frictionless bearings. Two 500 g blocks fall from above, hit the turntable simultaneously at opposite ends of a diagonal, and stick.

What will happen to plant height if the amount of available light is reduced due to global dimming? Which type of investigation would most likely be conducted to answer the following question?

A machine has an efficiency of 80%. How much work must be done on the machine so to make it do 50,000 J of output work?

What is the name of the area surrounding earth that is influenced by earth's magnetic field?

A 15 g turntable is covered with a uniform layer of dry ice that has a mass of 9.0 g. The angular speed of the turntable and dry ice is initially 0.75 rad/s. What is the angular speed of the turntable once all the dry ice has evaporated?

Rainwater was collected in water collectors at thirty different sites near an industrial basin and the amount of acidity (pH level) was measured. The mean and standard deviation of the values are 4.60 and 1.10 respectively.