Einstein Bee (Qualifying Round)

Two forces have magnitudes of 11 newtons and 5 newtons. The magnitude of their sum could NOT be equal to which of the following values?

• 16 newtons

• 5 newtons

• 9 newtons

• 7 newtons

A ball falling vertically from rest for 3 seconds travels very nearly:

• 14.7 meters

• 29.4 meters

• 44.1 meters

• 88.2 meters

Two vibrating particles that are "out of phase" differ in the phase of their vibration by:

• 1/4 cycle

• 1/2 cycle

• 3/4 cycle

• 1 cycle

A car is moving along a straight horizontal road at a speed of 20 meters per second. The brakes are applied and a constant force of 5000 Newtons decelerates the car to a stop in 10 seconds. The mass of the car is:

• 1250 kg

• 2500 kg

• 5000 kg

• 10 000 kg

When a person stands on a scale in an elevator at rest, the scale reads 800 N. When the elevator is allowed to fall freely with acceleration of gravity, the scale reads one of the following. The reading in the scale is:

• 1600 N

• 800 N

• 400 N

• 0 N

Which process in the human body does not require energy input from respiration?

• diffusion

• maintenance of a constant body temperature

• muscle contraction

• passage of nerve impulses

Why do you continue to breathe faster after finishing strenuous exercise?

• to deliver extra glucose to the muscles

• to keep the heart beating strongly

• to supply oxygen to break down lactic acid

• to supply tired muscles with extra energy

Why does chronic obstructive pulmonary disease (COPD) decrease the amount of oxygen in the blood?

• It causes lung cancer.

• It decreases the surface area for gas exchange in the lungs.

• It destroys red blood cells.

• It slows down breathing rate.

Which body cells are affected by the human immunodeficiency virus?

• gametes

• platelets

• red blood cells

• white blood cells

What is the common component of the three molecules RNA, DNA, and ATP?

• adenosine

• hydrogen bonds

• phosphate

• ribose