At night, you should drive at a speed that you can stop: In the distance illuminated ahead With ABS brakes Before you hit anything Quickly
Which roadway conditions does not cause loss of traction? a) gravel roads b) uneven surfaces C) snow and ice d) none of these
__ are very similar to diodes. none of the above Transistors Resistors all of the above Photovoltaic cells
The density of free electrons in gold is 5.90times 10^28electrons/m^3 Find the drift speed of electrons in a gold wire of diameter 2.98 mm when a current of 0.175 A flows through the wire. 17.8times 10^-6m/s 4.32times 10^-6m/s 15.8times 10^-8m/s 2.65times 10^-6m/s 3.00times 10^8m/s
Newton's laws of motior fail: when dealing with extremely low masses. for objects with extremely large masses. when using atomic clocks rather than stopwatches. at speeds significantly less than the speed of light. in helping us understand most of the everyday world.
A radioactive substance decays exponentially. A scientist begins with 140 milligrams of a radioactive substance. After 24 hours 70 mg of the substance remains. How many milligrams will remain after 27 hours? square mg Give your answer accurate to at least one decimal place Question Help: Video
The branch of biomechanics that deals with the aspects of moving systems is known as dynamics. kinetics. mobility. kinematics.
When a forklift is loaded, where is its center of gravity? A. Under the operator B. At the center of the forklift C. Varies based on the combined centers of gravity of the forklift and the load D. At the center of the forks
Living and Nonliving substances obey all of the answers the 1st law of thermodynamics. the 2nd law of thermodynamics. the law of gravity.
Whose laws of motion became the basic building blocks for our understanding of the functioning of the universe? Johannes Gutenberg Martin Luther Isaac Newton Francis Bacon Rewatch
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 $
