What element is used as a source of radiation in smoke detectors?

Which of the following is plotted on the x-axis of a distance versus time graph (A) Distance (B) Time (C) Speed (D) Velocity

A roundtrip to Mars is expected to take up to 2 years and this would be dangerous to human health. true or false

What happens to the temperature during an endothermic reaction?

A rock is sliding down a hill. Assume that the hill is 20 meters high and the rock has a mass of 1,000 kilograms.

Scientists now think high-fructose corn syrup may disrupt appetite control, making people more often o sleep get angry Ceat fast

Which of the following statements best describes the current state of understanding regarding the apparent acceleration of the expansion of the universe?

Should young people be allowed to do extreme sports? (give me two reasons why) 1. Opinion: 2. Reason why: 3. Reason why:

A light ray is incident on a reflecting surface. If the light ray makes a "35°" angle with respect to the normal to the surface, what is the exact angle (in degrees) made by the reflected ray relative to the normal?

Reimbursement means that a client is A. able to apply for healthcare insurance and refunded for a partial sum of the payment plan by the state. B.

Meg runs a 10km race in 45 minutes (0.75 hours). What was her speed in kilometers per hour? a. 22 km/hr b. 7.5 km/hr c. 4.5 km/hr d. 13 km/hr