Why are roads especially slippery right after it begins to rain? The rain mixes with oil and other fluids on the road Water ponds and floods the road It's an illusion - the roads are actually no more slippery than usual it's just that people are less careful

In snowy conditions how fast should you drive? At least 10 mph below the speed limit At the speed limit At 5 mph

What did Hubble discover about other galaxies? A. That most of them are moving away from us. B. That most of them are moving towards us. C. That most of them are much smaller than the Milky Way. D. That most of them only emit ultraviolet radiation.

A 100.0 g piece of iron (c=0.449J/g^circ C) at 95.0^circ C is placed in 200.0 g of water (c=4.184J/g^circ C) initially at 20.0^circ C What is the final temperature of the system? 23.6^circ C 57.5^circ C 27.2^circ C 31.4^circ C

Consider the melting of ice at 10^circ C and 1 atm. For this process, q_(sys)gt 0 What are the signs of Delta S_(sys),Delta S_(surr), and Delta S_(univ) Delta Ssysgt 0,Delta Ssurrlt 0,Delta Sunivgt 0 Delta Ssysgt 0,Delta Ssurrlt 0,Delta Sunivlt 0 Delta Ssyslt 0,Delta Ssurrgt 0,Delta Sunivgt 0 Delta Ssysgt 0,Delta Ssurrgt 0,Delta Sunivgt 0

Students in a physics class are required to complete at least three out of a collection of nine lab projects. In how many ways can a student satisfy the requirement? A student can satisfy the requirement in square different ways

Which condition causes the output voltage of a Hall-effect device to be produced? detecting a target not detecting a target

Which factors can cause turbulent flow? The diameter of a pipe is increased. The flow rate is reduced. The temperature to which the fluid is exposed decreases.

A vacuum pressure scale gauge that displays 29.92 is measuring atmospheric pressure a complete vacuum

If you are riding a bicycle at night,your front lamp should be visible from at least __ feet. C 1000 C 500 C 250 C 100

Hot Questions

1. Choose the correct statement or equation. When a wave in a string reflects from an open or flexible end, the reflected wave has the same wavelength and amplitude as the original wave. When a wave in a string reflects from a fixed end, the reflected wave has the same wavelength and amplitude as the original wave.

In what ways are meteorites different from meteors? What is the probable origin of each? Meteors typically come from comets that have passed through the solar system; their solid material is freed when the ice is vaporized by the heat of the Sun. Meteorites miss the atmosphere whereas meteors hit the outer layers only. Most meteors come from Mars and carry important information about the past of the red planet. Meteorites are large enough to withstand the violent passage through Earth's atmosphere, whereas meteors burn up from the heat of friction. Most meteorites, on the other hand, are from asteroids or from debris kicked up on the Moon or Mars during an impact.

If a rock is dropped from a height of 87 ft, its poistion t seconds after it is dropped until it hits the ground is given by the function $s(t)=-16t^{2}+87$ Round values below to 3 decimal places. How long does it take the rock to hit the ground? $\square $ seconds Find the average velocity of the rock from when it is released until when it hits the ground. $\square $ feet per second What time after the rock is thrown will its instantaneous velocity be equal to its average velocity? (Apply the Mean Value Theorem) $\square $ seconds after it is thrown

The bending or change in angle of light as it passes through a lens is called $\square $

Photons of a certain infrared light have an energy of $1.91\times 10^{-19}J$ (a) What is the frequency of this IR light? $\square $ Hz (b) Use $\lambda =c/f$ to calculate its wavelength in nanometers. $\square $ nm

The outer planets of the solar system were formed by asteroid agglomeration comet collisions gravitational forces temperature increases

Multiple Choice 2 points Step 3 of Part 2: The flashlight is shining to an azimuth of 225 degrees. What is the azimuth of the shadow? 0 degrees 45 degrees 90 degrees 180 degrees

1) The height of the Washington Monument is measured to be 170 m on a day when the temperature is $35.0^{\circ }C$ What will its height be on a day when the temperature falls to $-10.0^{\circ }C$ Although the monument is made of limestone, assume that its thermal coefficient of expansion is the same as marble's.

A point is subjected to 5 ksi biaxial tension. The diameter of the corresponding Mohr's circle is most nearly: O 5 ksi 7.07 ksi 10 ksi

A ball is thrown vertically upward. After r seconds, it's height him feet) is given by the function $h(t)=40t-16t^{2}$ After how long will It reach its maximum height? Do not round your answer. Time: $\square $ seconds