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Lainey Green
Physics
Suppose a person whose mass is m is being held up against the wall with a constant tangential velocity v greater than the minimum necessary. Find the magnitude of the frictional force between the person and the wall
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Jay Knox
Physics
A ball is being rolled by a normal push of 1000N. it is opposed by friction which has a force of 0.3kN and air resistance which has a force of 23N. Calculate the resultant force.
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Angelina Peterson
Physics
Consider a Young's two-slit experiment in which the wavelength of light is 37% smaller than the distance between the slits. How many complete dark fringes would be seen on a distant screen? (Assume for all these questions that the screen is as large as it needs to be.)
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Princess Galvan
Physics
Which of the following situations would produce an average velocity of zero?
A) a round-trip to school and back
B) a horse galloping in a field
C) the criss-crossing path of a flying bug
D) a trip, first to the moon, then onto Mars
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Taylor Chung
Physics
A 111.6 g sample of iron was heated from 0°C to 20°C. It absorbed 1004 J of energy. What is the specific heat capacity of iron?
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Shaun Moreno
Physics
A car is driving towards a brick wall at a constant velocity (don't try this at home!) and the driver honks the horn of the car. the sound of the horn reflects from the wall and the echo is heard by the driver. what can you say about the frequency of the echo?
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Jaylah Chaney
Physics
Mass number of an atom with 11 protons
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Donna Chavez
Physics
Which of the following elements is the most reactive?
Beryllium
Calcium
Magnesium
Barium
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Fletcher Glover
Physics
A flash of white light containing all the colors of the visible spectrum in air shines straight down on the surface of a pool. Which color of light from the flash reaches the bottom of the pool first? the blue light the yellow light the red light all colors arrive simultaneously
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Yadiel Norris
Physics
A car accelerates uniformly from 0 to 15m/s in 5 s. Calculate acceleration.
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Aditya Barron
Physics
Which device would a sleep researcher use to monitor a sleeping person's brain waves?
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Lillianna Holder
Physics
An experiment is performed to obtain the value of a physical property. If the true (i. e., correct) value of the property is 50 and the measured (i. e., experimental) value is 32, the percent error of the experimental result is:
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Linda Schultz
Physics
White moths were found in huge numbers in the city of Birmingham. These moths could be easily camouflaged by the trees. Because of sudden industrial development, the trees in the city were covered with soot. How will this change affect the population of white moths?
The population of white moths will decrease.
The population of white moths will increase.
No change will take place in the population of white moths.
The white moths will change their color.
The moths will change their food preference.
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Nevaeh Zuniga
Physics
What two factors determine how fast weathering occurs
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Haven
Physics
A sound that's produced by a single wave at a constant frequency and with no overtones is called
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