Which of the following is not true concerning warm-up exercises? a. they should be low-intensity. b. they should get progressively more intense. c. they should last 20 to 30 minutes. d. they should increase heart rate, breathing, and temperature. select the best answer from the choices provided. a b c d mark this and return save and exit

What is the function of the commutator in a dc motor? a. to spin the magnet b. to change direct current into alternating current c. to change alternating current into direct current d. to spin the wire coil

What happens in a global convection cell

Which best describes how fluids change as they travel through different portions of the convection currents? they change to solids at the outer portion of the convection currents. they change to solids at the inner portion of the convection currents. they become more dense at the outer portion of the convection currents. they become more dense at the inner portion of the convection currents