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Athena Mathis
Physics
A system absorbs 12 j of heat from the surroundings; meanwhile, 28 j of work is done on the system. what is the change of the internal energy Î'eth of the system?
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Kiley Ritter
Physics
How does the mass and size of a dwarf star compare with mass and size of the sun
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Gator
Physics
Direct current made it possible to distribute electric power over greater areas.
a. True
b. False
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Dana Cunningham
Physics
The structure of the atomOn the basis of Rutherford's experimental observations, which of the following statements predicts the structure of the atom?1. In an atom, negatively charged electrons are small particles held within a positively charged sphere. 2. In an atom, negatively charged electrons are dispersed in the space surrounding the positively charged nucleus of an atom. 3. In an atom, all of the positive and negative charges are randomly distributed. 4. In an atom, most of the mass and the positive charge are located in a small core within the atom called the nucleus. 2. In an atom, negatively charged electrons are dispersed in the space surrounding the positively charged nucleus of an atom. 4. In an atom, most of the mass and the positive charge are located in a small core within the atom called the nucleus.
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Lesly Shepard
Physics
Brian has a medical condition called cone dystrophy, which is a disorder of the cone cells in the eye. What symptoms would you expect Brian to have?
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Emilie Solomon
Physics
552000 in scientific notation
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Kayla Luna
Physics
How many units measure one wavelength?
a
16
b
8
c
2
d
4
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Howard Downs
Physics
During the first 5 seconds after a ball is dropped from rest, how far will it fall?
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Miguel Castro
Physics
Three solid, uniform flywheels, each of mass 65.0 kg and radius 1.47 m, rotate independently around a common axis. Two of the flywheels rotate in one direction at 3.83 rad/s; the other rotates in the opposite direction at 3.42 rad/s. Calculate the magnitude of the net angular momentum of the system.
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Nikolai Valencia
Physics
You stop for a cappuccino at a coffee shop and notice that the tiny white bubbles of steamed milk remain on the surface of the coffee. These air-filled bubbles stay where they are, rather than descending into the coffee or rising into the air, because they are:
A. more dense than the coffee but less dense than the air above thecoffee.
B. thicker than the coffee but less thick than the air above thecoffee.
C. less dense than the coffee but more dense than the air above thecoffee.
D. lighter than the cup of coffee but heavier than the column ofair above the coffee.
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Patricky
Physics
What is power?
A: power is the rate at which energy is used up
B: power is force multiplied by distance
C: power is the amount of work that is done
D: power is the rate at which work is done
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Lil Mama
Physics
What is the only place we know of vaccines exists in science
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Guest
Physics
In 1991 four English teenagers built an eletric car that could attain a speed of 30.0m/s. Suppose it takes 8.0s for this car to accelerate from 18.0m/s to 30.0m/s. What is the magnitude of the car's acceleration?
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Peters
Physics
What must you do if you plan to exercise everyday
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Marshall Blair
Physics
Determine the speed of sound in air at 700 K. Also determine the Mach number of an aircraft moving in the air at a velocity of 340 m/s. The gas constant of air is R = 0.287 kJ/kg·K. Its specific heat ratio at room temperature is k = 1.4. The speed of sound in air at 700 K is m/s. The Mach number of the aircraft is.
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