Astronomers estimate that new stars form in our galaxy at the rate of about A one per year. B a few (2-3) per year. C 100 per year. D 20-30 per year. E ten per year.
How many planets are in our solar system? Fifteen Six Three Nine
What two kinds of forces influence waves? Select one: restorative and generating forces backwards and forwards forces the force and not the force thermal force and exthermal force
What is the SI unit in the measurement of radioactivity? Multiple Choice Ci mCi uCi Bq rutherford
When we see a crescent moon the rest of the face that we see is not completely dark because __ A) it is partially facing toward the Sun B) it is slightly illuminated by sunlight reflected by Earth C) it is slightly illuminated by the light of Earth's cities D) it is slightly illuminated by starlight
18. A Hot Wheels car rolls off a table at a speed of 3.57m/s and hits the floor a distance of 0.91 meters from the table's edge. Determine the height of the table.
According to Newton's First Law.what happens to an object that is at rest and has no outside forces acting upon it? The object will begin to lose mass. The object will create its own moving force. The object will stay at rest. The object will gain acceleration over time.
A 14.5 kg barrel is pulled with a 22.1 N force at a 48.7^circ angle,, across the ground where the coefficient of friction (mu _(k)) is equal to 0.200. What is the normal force acting upon the barrel? n=[?]N
Multiple Choice 1 point The amount of energy required to raise the temperature of 1 kilogram of water by 1^circ Celsius is a calorie joule measure of density kilocalorie None of the answer choices are correct
2. the distance between stars 10^6 10^8 10^15 centimeter petameter meter
You are-tonsidering whether to buy a house for $\$ 80,000$ or another identical house located near high-voltage electric power lines, for $\$ 70,000$ Assume that it has been established that living near high-voltage lines increases the risk of cancer due to electromagnetic fields (EMFs). True or False: If you choose the $\$ 70,000$ house, the radiation from EMFs is not an externality. True X False
Question 1 Light travels faster in: 1. warm air 2. cool air 3. a vacuum. Question 2 When white light goes from air into water,the color that refracts the most is: 1. red 2. orange 3. green 4. violet 5. all refract the same amount. Explain.
What is the maximum number of electrons that the $7^{th}$ energy level can accomodate? 8 32 49 98
A piece of chocolate melts in your mouth This is an example of heat conduction. heat convection. heat radiation. thermal expansion. none of the above.
Question 4 Which of the following objects would require the use of a small-scale model? An atom The planet Saturn The highway system in Florida The path of an ocean current
Of an initial amount of 1000 g of lead-210, how much will remain in 160 years?Lead-210 decays at a rate of $3.15\% /yr$ $\square $ g (Round to one decimal place as needed.)
Which symbol represents a gamma ray? A. $\alpha $ B. $\gamma $ C. $\beta ^{-}$ D. $\beta ^{+}$
Select the correct answer. Which of Newton's laws states that "every action has an equal and opposite reaction"? A. first B. third C. second D. fourth
Refraction results from changes in light's speed. all of the above incident angles. frequency.
Essay: In your own words, explain why a simple pendulum's period does not depend on the mass on the end of the pendulum. $\square $
