To keep chickens warm in a shed on a cold night, it is best to use a fluorescent lamp. an incandescent lamp. a CFL lamp. an LED lamp.

When your left fender is lined up with the lane boundary, approximately how many feet from the left edge of your lane will you be? 4 ft. 1 ft. 3 ft. 2 ft.

5.27 A 45.0 kg crate of tools rests on a horizontal floor.You exert a gradually increasing horizontal push on it,and the crate just begins to move when your force exceeds 313 N. Then you must reduce your push to 208 N to keep it moving at a steady 25.0cm/s (a) What are the coef- ficients of static and kinetic friction between the crate and the floor? (b) What push must you exert to give it an acceleration of 1.10m/s^2 (c) Suppose you were performing the same experiment on the moon, where the acceleration due to gravity is 1.62m/s^2 (i) What magnitude push would cause it to move? (ii) What would its acceleration be if you maintained the push in part (b)?

The factor which has the most control over image density is: kVp (kilovotage peak) mA (milliamperage) film speed film brand

A piece of metal with a mass of 32.8g is heated to 100.5^circ C and dropped into 138.2 g of water at 20.0^circ C The final temperature of the system is 30.2^circ C What is the specific heat capacity of the metal? Specific heat of water=4.184J/gC 0.391J/gC 2.56J/gC 5.29J/gC 3.5J/gC

An object becomes positively charged by gaining protons. True or False True False

In longitudinal waves, the medium Multiple Choice vibrates in a direction perpendicular to the direction of motion of the wave. vibrates in the same direction the wave is moving. moves in sort of a circular motion. doesn't vibrate; the disturbance just moves through the medium.

4.26 Identify the type of subatomic particles described by each of the following: a. atomic number b. mass number C. mass number - atomic number d. mass number + atomic number

3.44 Identify each of the following changes of state as melting, freezing, sublimation, or deposition: a. Dry ice in an ice-cream cart disappears. b. Snow on the ground turns to liquid water. C. Heat is removed from 125 g of liquid water at 0^circ C. d. Frost (ice) forms on the walls of a freezer unit of a refrigerator.

Why is Neptune denser than Saturn? Neptune has a different composition than Saturn, including a higher proportion of hydrogen compounds and rocks. Neptune has a greater proportion of hydrogen than Saturn. The extra mass of Neptune compresses its interior to a greater extent than that of Saturn. Neptune is not denser than Saturn. Neptune's hydrogen is molecular whereas Saturn's hydrogen is atomic.

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