Leah has a mass of 50kg and is using a 3.4m ladder. The acceleration is equal to 9.8 meters per second squared. What force, in Newtons, does Leah exert on the ladder when she is standing on it?

A light-year is а bout: 6 million miles 6 million kilometers 6 billion miles 6 trillion miles

How much power should a braked 1.5t car have to be braked to reduce its speed from 30m / s to 10m / s in 5s?

Two people are 16km apart on a straight road. They start walking at the same time. If they walk towards each other, they will meet in 2 hours, but if they walk in the same direction (so that the distance between them is decreasing), they will meet

A man cleaning his apartment pushes a vac-uum cleaner with a force of magnitude 42.8 N. The force makes an angle of 16.5◦with the hor-izontal floor. The vacuum cleaner is pushed2.62 m to the right along the floor. Calculate the work done by the 42.

An elevator filled with passengers has a mass of 1683 kg. (a) The elevator accelerates upward from rest at a rate of 1.20 m/s2 for 2.75 s. Calculate the tension in the cable (in N) supporting the elevator. g

What is the period of a wave if the frequency is? 5 Hz

Which of the following statements about dark matter and dark energy is/are true? Choose one or more: Both exceed the matter-energy equivalent of luminous matter. Dark matter has only an attractive gravitational effect, while dark energy is repulsive.

On the sun is the corona above the photosphere?

Which sequence shows electromagnetic waves arranged from shorter to longer wavelengths?. A. visible light, infrared radiation, microwaves, and ultraviolet rays. B. infrared radiation, Visible light, ultraviolet rays, microwaves. C.

Will the April 29th 2020 astroid be the end of humanity as we know it?