Determine the amount of time for polonium-210 to decay to one fourth its original quantity. The half-life of polonium-210 is 138 days. Explain.

An object has an x-momentum of 8.5 kilogram·meters/second and a y-momentum of 9.8 kilogram·meters/second. What is resultant momentum of the object?

Transpiration is part of what cycle? The carbon cycle The nitrogen cycle The oxygen cycle The water cycle

Which coefficient of O2 is needed to balance the equation C3H8 + O2 → 3CO2 + 4H2O? a. 2 b. 3 c. 5 d. 6

A substance in which at least two types of atoms are chemically combined is

Imagine the moon rotated twice in the same amount of time the moon orbits earth once would you be able to see the moons far side from earth explain

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