If element X has 21 protons, How many electrons does it have?

A person weighing 500 N climbs on a rope. What is the tension on the rope?

The mass of a rigid rod is 0.60 kg and its length is 39.0 cm. Calculate the moment of inertia (in kg · m2) for the rod if it is pivoted about an axis through the center of mass of the rod. (Assume the axis is perpendicular to the rod.

Which of the answer choices best describes the property of volume? the amount of space a substance's matter occupies the amount of matter a substance contains the compactness of matter in a given space the extent of a substance's surface

What happens if a hypothesis is not supported?

A particular wave can be described as transverse and self-propagating. What type of wave could it be? A sound wave A seismic wave An ocean wave A radio wave

How many constellations are there?

What units are given to the right of the equals sign

Vector has a magnitude of 5.2 units and is directed east. vector has a magnitude of 4.3 units and is directed 35° west of north. by constructing vector diagrams, find the magnitudes and directions of (a) and (b) 4. (a)

Which of the following has the greatest momentum? A - Truck with a mass of 2250 kg moving at a velocity of 25m/s B - car with a mass of 121010 kg moving at a velocity of 51 m/s C - truck with a mass of six 6120 kg moving at a velocity of 10 m/s

How is a magnetic field generated?