Calculate the heart rate reserve for a 40-year-old with a resting heart rate of 75. a. 80.5 b. 105 c. 115.5 d. 130.2

The Eiffel Tower is a steel structure whose height increases by 19.4 cm when the temperature changes from - 9 to 41 oC. What is the approximate height (in meters) at the lower temperature?

Describe how switching the desk lamp on and off shows that light waves transfer energy

Question 1 Unsaved Sun 101 - Which two complementary forces keep the Sun from blowing itself up? Question 1 options: fusion and magnetism helium and hydrogen photons and magnetism fusion and gravity

The mass of ball A is 10 kilograms and the mass of ball B is 5 kilograms. If the initial velocity is set to 3 meters per second for each ball, what is the final velocity of ball B if the final velocity of ball A is 2 meters per second?

A toy rocket with a mass of 300 g takes off in a vertical direction under the influence of gravity. it burns fuel at the rate of 25 g/s. the exhaust speed of the gases is 80 m/s. what is the speed of the rocket at the end of 10 seconds?

A slow jogger runs a mile in 16 minutes. Calculate the speed in

Protecting his nest, a 600-g peregrine falcon rams a marauding 1.5-kg raven in midair. the falcon is moving at 20.0 m/s, and the raven at 9.00 m/s at the moment of impact.

A carousel has a radius of 1.70 m and a moment of inertia of 110 kg · m2. A girl of mass 44.0 kg is standing at the edge of the carousel, which is rotating with an angular speed of 3.40 rad/s.

A 2kg marble is moving at 3 m/s when it strikes another 4kg marble moving in the opposite direction at - 3 m/s. What will be the velocity of the 4kg marble after the collision of the 2kg marble's new velocity is - 4 m/s.

How long did it take to reload a rifle during the 18th 19 century?