In the Winter Olympics, an ice skater may lift his partner high above his head. A typical female ice skater weighs 400 N, and the male can usually lift her 1.4 m above the ice. How much work does the male ice skater exert when he lifts the female ice skater 1.4 m above the ice? A. 560 J B. 286 N-m C. 560 N-m D. 286 J
The homeowner installs an electrically heated mirror into the shower room.When a person has a shower, the heated mirrors does not become misty but stays clear. Why does the mirror stay clear?
A portion of the mesosphere and thermosphere known for its ability to "bounce" radio signals is the _____________ a. exosphere b.ionosphere c.stratosphere d.troposphere
Which of the following is the visible part of the spectrum of light? (Points : 3) gamma rays sound waves microwaves color
A car whose mass is 1000 kg is traveling at the constant speed of 10 m/s. Neglecting any friction, how much will the engine have to supply to keep going the same speed?
where is a trench most likely to occur? A.transform plate boundary between continental plates B.divergent plate boundary in a continental plate C.transform plate boundary between oceanic plates D.convergent plate boundary involving an oceanic plate
Which are functions of proteins? Choose all answers that are correct. A. to carry electrical signals quickly through the body B. to store energy reserves C. to fight infection D. to be structural material
A steel ball bearing of mass 0.06 kg at a height of 1.5m above a steel tables is released from rest and it is found to rebound to a height of 1.3m calculate the gravitational potential energy lost during the fall and the kinetic energy of the ball bearing jusr before impact and the speed of the ball bearing just before impact and the gravitational potential energy gained by the ball bearing when it rebounds to a height of 1.3m. Assume that the gravitational field strength is g=10N/kg
Well into the twentieth century, many scientists believed the ocean floor was A. rocky. B. flat. C. round. D. sandy.
Hi guys. Im doing a project at school where we have to create a mouse trap powered car. I wanted to know what materials are a must have to make the car move more than 5 meters?
You calculate the ___of a machine by dividing its __ by its work input and multiplying by 100 CHOICES work work output efficiency
