A model airplane exerts 0.45 newton's over a distance of 250 meters. How much work was the plane doing?

The diagram shows the set-up for an electric doorbell. Which best explains why the bell would not ring in this set-up? The circuit is open. The electromagnet has an iron core. The circuit is closed. The electromagnet is made of steel.

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K. Cylinder A contains He, cylinder B contains O2, and cylinder C contains SO2. According to the kinetic molecular theory, which gas has the highest average speed?

Which theory of language development and acquisition includes the concepts of reinforcement, stimuli control, deprivation, and aversive stimulation? a. skinner's idea of language b. jean piaget's theory of cognitive development c.

As the bright sun shines upon the water, the water slowly disappears. the same sunlight gives energy to the surrounding plants to convert water and carbon dioxide into sugar and oxygen gas which change is physical and which is chemical

If the current and the resistance in a circuit both double, what will happen to the voltage? A. stays the same B. doubles C. halves D. quadruples E. decreases by a factor of 4

After creating a question and forming a hypothesis, what is the next step in the scientific method

Roger sees water balloons fall past his window. He notices that each balloon strikes the sidewalk 0.51 s after passing his window. Roger's room is on the second floor, 10 m above the sidewalk.

Which statements accurately describe the Doppler effect?

Describe how mass and distance affect gravitational force.

a bike can climb the inclined road at uniform speed of 72 km/hr by applying force 500N what will be the power applied by the bike?