The u. s has sent unmanned spacecrafts to ___ the planets in our solar system

a. all

b. none of

c. some

d. most

(its not c nor d)

Does thermal energy flow from warmer objects to cooler objects

9. A radioisotope has a half-life of 4.50 min and an initial decay rate of 8400 Bq. What will be the decay rate after 18.0 min?

What do we call an instrument that makes things look large?

Compare the times necessary for the various stages in the formation of a star like the sun Why are some short and why are some long?

Feeling slightly uncomfortable during exercise A. is completely normal and is to be expected. B. means that you're completely out of shape. C. can indicate that there's a problem with your heart.

What is the weight on earth of a girl with a mass of 38 kg?

50g of ice at 0°C is mixed with 50g of water at 80°C, what will be the final temperature of a mixture in degrees C?

If the Density of an object is 5.2 g/cm3, and its volume is 3.7 cm3, what is its mass

The direction of the magnetic field is determined by which of the following? A. energy of the current B. magnetic domain C. magnetic force D. direction of the current

A ship is traveling at 154 m/s and accelerates at a rate of 1.80 m/s^2 for 1 minute. What will its speed be after that minute? Calculate the answer in both meters per second and kilometers per hour.