According to the most widely accepted scientific explanation, how did the universe begin?

A. As a collection of protons and neutrons

B. As a cloud of gas and dust

C. With a huge collision

D. With a giant expansion

Suppose all the grains in a sample of sand were exactly the same size. Could the sample still be a heterogeneous mixture?

Why would a person choose to tie a helium-filled balloon to a child's wrist instead of simply having the child hold on to it? A. Helium is less dense than air, so it will float above air if the child lets go of the balloon. B.

Regions in a sound wave where particles are farthest apart are called

Moustapha jones reaches the bottom of a hill on his bike moving at a speed of 8.6 m/s when his chain breaks. he coasts up the hill until he comes to a stop after 3.5 s.

Suppose you have an unknown clear substance immersed in water, and you wish to identify it by finding its index of refraction. You arrange to have a beam of light enter it at an angle of 45.7∘, and you observe the angle of refraction to be 30.5∘.

A 282 kg motorcycle moves with the velocity of 4 m/s what is the kinetic energy

How much does an average straw bale weigh?

What part of an egg is most similar to the cell membrane

How many seconds are there in the month of March

What is a neoplasm? A. Another word for a malignant tumor B. A type of carcinoma that grows only in the mouth C. A benign swelling of epithelial cells D. Any new and abnormal growth