Two identical freight cars roll without friction towards each other on a level track. one car rolls 2 m/s the other 1 m/s. after the cars collide they couple and roll together with a speed of

10. How much U. S. oil demand is represented by the large oil tanker?

36 of 50 Constants A 89.0-kg refrigerator sits on the floor. The coefficient of static friction between the refrigerator and the floor is 0.60. What is the minimum force that one needs to exert on the refrigerator to start the refrigerator sliding?

You could use an elevator or stairs to lift a box to the tenth floor. Which has greater energy? Why?

If you were going to invent a new way to power your mobile phone, which type of electromagnetic wave would be most useful to investigate? A. Radio waves, because they are high energy and common. B. Gamma rays, because they are strong and safe. C.

Which of the rolling statement is not true about proper tire care? A. If you see a weaver bar across the width of the tread. B. properly inflated tired are critical to vehicle control and good gas mileage. C.

A scientist pours grape juice on three identical white shirts He then uses three different cleaning products on the shirts and measures how clean they get what is the independent variable in this experiment

What part of the atom does nuclear radiation come from?

Why should scientists write reports and give oral presentations of the steps and results of their in investigations?

Which of these rocks are formed by volcanic activity? select the two correct answers. a. marble b. basalt c. limestone d. granite e. sandstone

Which source is most likely an authority on the subject? Dr. Vale, a pediatrician, discusses electrical circuitry on her home-improvement website. Jonah, an amateur cook, teaches his son how to make the best grilled cheese sandwiches.