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Jamar Wiggins
Physics
When an 81.0-kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2.25 103 j. by how much does the potential energy of a (n) 17.5-kg child increase when the child climbs a normal staircase to the second floor?
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Chump
Physics
The steam created from the boiler turns a turbine. What type of energy conversion does this represent?
chemical energy to heat energy
heat energy to mechanical energy
steam energy to kinetic energy
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Alena Zhang
Physics
An astronaut goes out for a space walk. Her mass (including space suit, oxygen tank, etc.) is 100 kg. Suddenly, disaster strikes and her tether line becomes disconnected, so she is stuck at rest a distance x away from the space craft!
Luckily, you have to know physics to be an astronaut. The astronaut takes off her 15 kg oxygen tank and throws it away from the spacecraft with a speed of 10 m/s. Due to conservation of momentum, she is propelled towards the spacecraft.
The astronaut has 1.5 minutes of oxygen remaining in her space suit to get her back to the craft. What is the maximum distance the astronaut can be away from the spacecraft to make it back before she runs out of oxygen?
Part A: What are the Known Variables and Unknown Variables? list them.
Part B: What are the equations needed to solve this problem?
Part C: Solve the problem.
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Elaine Cordova
Physics
What would happen if cell membranes suddenly became permeable instead of selectively permeable could cells remain alive?
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Boyle
Physics
2. Which of the following is closest to 1 meter in length?
A. a penny
B. the width of a door
C. the height of a room
D. the size of the Earth.
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Guest
Physics
The SI unit for energy is the Joule (J). Sam wants to convert 338.25 J into kJWhich operation should he choose?
a. He should multiply 338.25 by 10.
b He should multiply 338.25 by 100.
c He should divide 338.25 by 100.
c He should divide 338.25 by 1000.
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Gaines
Physics
A pet-store supply truck moves at 25.0 m/s north along a highway. inside, a dog moves at 1.75 m/s at an angle of 35.0° east of north. what is the velocity of the dog relative to the road
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Jared Payne
Physics
The speed of sound in air depends on temperature.
a. True
b. False
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Pierre
Physics
Drag each statement to the correct location on the table.
Match the characteristics with the states of matter.
does not have
a definite shape
or volume
has definite volume
but does not have a
definite shape
has a definite shape
and volume
changes to liquid
on heating
changes to liquid
on cooling
changes to solid
on cooling
Solid
Liquid
Li
Gas
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Christine Chambers
Physics
Which of the following changes can happen when the forces on an object are unbalanced?
a. The object speeds up
b. the object slows down
c. the object changes direction
d. all of the above
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Alia Gallegos
Physics
Technician A says that engine parts should be be cleaned before a thorough test can be done to detect cracks. Technician B says that pressure testing can be used to find cracks in blocks or cylinder heads. Who is right?
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Lauryn Griffin
Physics
How are mathematics and science related?
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Rayan
Physics
Radio telescopes detect waves with a wavelength of roughly 10 m.
True
False
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Ismael
Physics
2. A 0.30 kg ball is dropped onto a concrete driveway. The ball's velocity before impact is 4.5 m/s and after impact is 4.2 m/s. What is the change in the ball's momentum?
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Haleigh Boyle
Physics
If we start with 400 atoms of a radioactive substance, how many would remain after one half-life? After 2 half-lives? After 3 half-lives? After 4 half-lives?
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