A train travels 78 kilometers in 2 hours, and then 60 kilometers in 3 hours. What is its average speed?

What came first, the egg or the chicken?

What is happening inside a star while it expands into a subgiant?

To a good approximate, the only external force that does work on a cyclist moving on level ground is the force of air resistance. Suppose a cyclist is traveling at 15 km/h on level ground. Assume he is using 480 W of metabolic power. a.

A bat hits a ball; which has the greater acceleration, the bat or the ball? The bat because it has a larger mass than the ball. The ball because it has a smaller mass than the bat.

Which of the following is a good safety precaution when planning a weight training program? Question 5 options: Don't overdo the weight Never lift alone Have a day of rest between workouts All of the above

the half-life of carbon - 14 is 5730 years. What fraction of carbon-14 would remain after 11,460 years?

An object with a mass of 10.9 kg experiences a force of 18.53 N. What is the acceleration of the object? A. 2.2 m/s2 B. 1.7 m/s2 C. 16.83 m/s2 D. 1.3 m/s2

A proton, starting from rest, accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field. What is the radius of the proton's resulting orbit

Which of the following terms are needed to completely describe speed? Check all that apply. A. Units B. Direction C. Number D. Mass

Drivers are able to see objects ahead of them because light travels through windshields.