An atom of an element has 38 electrons. What is also true of that atom?

A.

It has an atomic mass of 38.

B.

It has 38 protons.

C.

It has 38 neutrons.

D.

It bonds with 38 elements.

I got B

Which of the following is an example of something that undergoes acceleration while moving at a constant speed? 1. A man standing in an elevator 2. A car making a circle in a parking lot 3. None of these.

Which of these is an example of acceleration? a bicyclist turning around a corner a car traveling south with its cruise control set a bus traveling north at 25m/s a helicopter waiting to take off

How does energy cause change?

You are trying to determine the identity of an unknown metal object using density. You measure the volume by displacement using a graduated cylinder. The initial volume is 14.7 mL, and the final volume is 23.5 mL.

1. In the laboratory, the life time of a particle moving with speed 2.8 x 10^10 cm/s is found to be 2.5 x 10^-7. Calculate the proper life of the particle.

What was his average swimming speed during the second half of the race if he tied the record, which was at an average speed of 2.05 m/s?

Objects A and B have equal amounts volumes and are both traveling at 25 miles per hour. Object A is much denser than Object B. Which object has a greater amount of force and why

An airplane with a total mass of 850 kg has an engine malfunction, causing it to provide a constant horizontal force of 4000 N. The pilot, who has a mass of 80 kg, decides to eject from the airplane.

When less force is used but the amount of work done remains the same, how does distance change? A) distance stays the same B) distance increased C) distance decreased D) distance is dependent on the mass of the object

A student pushes a 60-N block across the floor for a distance of 10 m. How much work was done to move the block