Why is it good practice for scientists to repeat trails

A daredevil is shot out of a cannon at 45.0° above horizontal with an initial speed of 25.0 m/s. a net is positioned a horizontal distance of 50.0 m from the cannon.

A car leaves a garage at 10 mph. it speeds up to 20 miles per hour in the city and eventually increases to 50 miles per hour in the country. overall, the car went 50 miles during 1.5 hours of travel time. what was the car's average speed

A circuit contains three 1,200 ohm resistors connected in parallel. The circuit's supply voltage is 12 VDC. What is the total power in this circuit? a. 0.03 W b. 1.42 W c. 0.36 W d. 0.47 W

How does the viscosity of a liquid affect the definition of a liquid?

A simple pendulum 2 m long swings through a maximum angle of 30? with the vertical.

You slide a box of books at constant speed up a 30° ramp, applying a force of 200 n directed up the slope. the coefficient of sliding friction is 0.18.

Two trains leave the same station at the same time. The first train travels north at 60 mph. The second train travels west at 45 mph. Find how fast the distance between the trains is changing two hours after the trains have left.

If the room radius is 4.5 m, and the rotation frequency is 0.8 revolutions per second when the floor drops out, what is the minimum coefficient of static friction so that the people will not slip down?

Energy of motion is known as what energy

While a constant total force of 17 n is exerted on a cart, the cart's acceleration is 5 m/s2. find the mass of the cart?