A 900-N lawn roller is to be pulled over a 5-cm (high) curb. Radius of roller is 25 cm. What minimum pulling force is needed if angle made by handle is (a) 0 deg (b) 30 degrees?

Which statement describes a step in the formation of an ionic bond? An attraction occurs between two ions that have the same charge. A metal atom forms a cation, and a nonmetal atom forms an anion.

What happens when an immovable object meets an unstoppable force?

Draw a flow map showing the flow of energy transformations in the car from starting vehicle to driving. you should have five types of energy.

A car advertisement states that a certain car can accelerate from rest to 20 m/s in 7 seconds. How far does this car go? What is the car's acceleration?

Which of these statements best explains why P waves arrive earlier than S waves at the seismic station? A. S waves are generated after P waves arrive at the surface B. S waves make longer lines on the seismogram than P waves C.

What has become an important alternative to Piagetian approaches?

How would life on earth be different if earth's axis were not tilted with respect to its orbit? A. There would be no seasons. B. There would be no day and night. C. All places would have the same climate. D. The seasons would be much shorter.

What will a spring scale read for the weight of a 75.0-kg woman in an elevator that moves upward with constant speed of 5.8 m/s?

What's the definition of: • cellular respiration • photosynthesis

What are the steps that are important to take for your safety during an earthquake? a. stay away from walls and windows c. stay away from electrical and gas lines b. get under a desk or table d. all of the above