If element X has 90 protons, how many electrons does it have?

if a mint is on a turn table that is rotating at 34 RPM's, and is 23 (cm) away from the center of the record, what is the Tangential Acceleration?

A box has a mass of 5.8 kg the box is lifted from the garage floor and placed on a shelf 2.5 M off the ground how much gravitational potential energy energy does the Box have before it falls off the shelf a 18.3 J B100 42.1 m / s c 14.5 J d 142.1 J

Suppose you are given a 4 m long straight bar of uniform density balanced at its center and a weight of 4.6 kg hanging on the bar at a distance of 12.0 cm from the pivot. Where must we hang a 2.6 kg mass to have the system remain in balance?

An echo is heard when sound is reflected off a surface. Which of the following best explains this phenomenon?

When Jackson throws a baseball in a straight path, what two forces cause the ball to eventually stop moving?

A hurricane in the Gulf of Mexico to 15 hours to travel 360 kilometers. What is the average speed of this hurricane in kilometers per hour?

Which organization functions to privide clinics and surgeries i developing nations

What role do convection currents play in oceans and the atmosphere?

What causes density currents to form in the mediterranean sea? a. condensation b. evaporation c. transpiration d. upwelling

How long does it take a car to travel 450 km at 75 km/hr