A train of mass 800000kg is slowing down. What acceleration is produced if the braking force is 1400000

If m represents mass in kg, v represents speed in m/s, and r represents radius in m, show that the force F in the equation F=mv^2 / r can be expressed in the unit kg*m/s^2

At apogee, the center of the moon is 406,395 km from the center of Earth and at perigee, the moon is 357,643 km from the center of Earth. What is the orbital speed of the moon at perigee and at apogee? The mass of Earth is 5.98 1024 kg.

A ruby has a density of 3.9 g/cm³. What is the mass of the ruby, if its volume is 5 cm³? A. 0.78 g B. 1.28 g C. 8.9 g D. 19.5 g

you and a friend sit still on a spinning merry-go-round. The merry-go-round spins 5 times every second, and to a stationary observer, you have a speed of 9m/s. From your frame of reference, what is the speed of your friend?

When the air in a submarine's huge air tanks is decompressed and it displaces the water in the ballast tanks with air, what does the submarine do? A. It sinks B. It floats C. It provides air to the passengers

Shows a 190 g hamster sitting on an 820 g wedge-shaped block. the block, in turn, rests on a spring scale. an extra-fine lubricating oil having μs=μk=0 is sprayed on the top surface of the block, causing the hamster to slide down.

What will happen to the hydronium ion concentration and pH of the water if hydrochloric acid is added to water?

What is the main driver of the water cycle

What two types of evidence are used to classify orgianisms?

What is the name of the fine soil particles deposited by rivers?