11. A car has a speed of 90 km/h and a mass of 7 000 kg. What is its kinetic energ

If your heart rate is 150 beats per minute during strenuous exercise, what is the time per beat in units of seconds?

Assuming one nerve impulse must end before another can begin, what is the maximum firing rate of a nerve in impulses per second?

Since 1995, hundreds of extrasolar planets have been discovered. There is the exciting possibility that there is life on one or more of these planets. To support life similar to that on the Earth, the planet must have liquid water. For an Earth-like planet orbiting a star like the Sun, this requirement means that the planet must be within a habitable zone of 0.9 AU to 1.4 AU from the star. The semimajor axis of an extrasolar planet is inferred from its period. What range in periods corresponds to the habitable zone for an Earth-like Planet orbiting a Sun-like star?

(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) . As a car goes around a curve, the driver increases its speed. This means the car has two accelerations. What are the directions of these two accelerations?

Explain how the choice of the “Stem of interest” affects which forces must be considered when applying Newton's second law of motion.

The average density of the Sun is on the order 103kg/m3 . (a) Estimate the diameter of the Sun. (b) Given that the Sun subtends at an angle of about half a degree in the sky, estimate its distance from Earth.

(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) . What is centripetal acceleration? What is the direction of the centripetal acceleration of a car going around a curve?

(Indicates a review question. which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) . An extreme roller coaster is moving along its track. During a brief period the track exerts a downward force on the cars. Describe what is happening. (What is the shape of the track at this point?)

(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) A woman is riding on a train while watching the display on her GPS unit. She notices that both the speed’ and the “speed” readings are not changing. What can the stir conclude about the net force acting on the train car?