A 60kg girl standing on rollerskates (with no friction between the skates and the ground) throws a 5kg medicine ball to the right with a speed of 6m/s. Find the recoil velocity of the skater.

An electromagnetic wave in a vacuum has a wavelength of 0.032 m. What is its frequency?

You drop an object from a second floor window. Describe the speed of the object after 1 second

Which of the following is NOT an example of a transmutation? A. Uranium-238 emits an alpha particle forms thorium-234 B. Uranium-238 is bombarded with a neutron to produce uranium-239 C. Potassium-38 emits a beta particle and forms argon-38 D.

Even if it is wrong, why is a hypothesis important?

You have family members and the relationship you observed in childhood affects the quality of your current relationships?

Suppose s (t) is the position of an object moving along a line at time t is greater than or equal to 0. What is the average velocity between the times t=a and t=b? What is the instantaneous velocity at t=a?

Estimate how long it would take one person to mow a football field using an ordinary home lawn mower. suppose that the mower moves with a 1-km/h speed, has a 0.5-m width, and a field is 360 ft long and 160 ft wide. 1 m = 3.281 ft.

Badri makes the table below to review the factors that affect the electric force between objects. Which change will correct the error in Badri's table?

A star with the same mass of the sun has a newly discovered planet whose semi-major axis of 2.48 au and an eccentricity of 0.08. what is the aphelion distance of the new planet

A weather balloon is inflated to a volume of 2.2 x 10^3 L with 374 g of helium. What is the density of helium in grams per liter?