A boat takes 3.0 hr to travel 27 km down a river, then 6.0 hr to return. How fast is the river flowing?

A 10-meter-long spear is thrown at a relativistic speed through a 10-meter-long pipe (both measured when at rest.) when the spear passes through the pipe, a. the pipe shrinks so the spear extends at both ends. b.

A car is originally traveling at 15.0 m/s on a straight horizontal road. The driver applies the brakes, causing a car to decelerate uniformly at 4.00 m^2 until it comes to rest. Calculate the car's stopping distance.

A low-pressure sodium vapor lamp whose wavelength is 5.89 x 10-7 m passes through double-slits that are 2.0 x 10-4 m apart and produces an interference pattern whose fringes are 3.2 x 10-3 m apart on the screen. What is the distance to the screen?

A 1240-kg car is traveling with a speed of 15.0 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 31.8 m?

Contrast inference and prediction.

Matthew rolls a bowling ball with a speed of 2 meters/second. The ball hits the pins with 1.8 joules of kinetic energy. The mass of the bowling ball is kilograms. NextReset

Many schools require freshmen to live

What do hydroelectric plants use to generate electrical energy?

The specific heat capacity of lead is 0.13 J/g-°C. How much heat (in J) is required to raise the temperature of of 91 g of lead from 22°C to 37°C?

What are some potential impacts to organisms during a global warming event?