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Deangelo Chambers
PhysicsPhysics
Select all that apply. Which of the following are elements? O2 Ca KF B
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Eli Abbott
PhysicsPhysics
Why is accuracy important in dodgeball?
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Imani Myers
PhysicsPhysics
A pipe has a length of 1.29 m. Determine the frequency of the first harmonic if the pipe is open at each end. The velocity of sound in air is 343 m/s. Answer in units of Hz.
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Skunk
PhysicsPhysics
The half-life of plutonium-238 is 87.7 years. What percentage of the atoms in a sample of plutonium-238 will remain radioactive after 263.1 years? % What percentage of the atoms in the same sample of plutonium-238 will have changed to another isotope after 263.1 years?
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Reese Boyd
PhysicsPhysics
Charge q is 1 unit of distance away from the source charge S. Charge p is four times further away. The force exerted

between S and q is ___ the force exerted between S and p.

1/4

1/16

16 times

4 times
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Marin Crosby
PhysicsPhysics
A 21.7kg child descends a slide 3.5 m high and reaches the bottom with a speed of 2.2m/s. How much thermal energy due to friction was generated in this process?
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Kaeden Pitts
PhysicsPhysics
Which term refers to a substance that can only be broken down chemically? A. metals B. molecules C. matter D. mixtures
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Mariah Dominguez
PhysicsPhysics
A 12,000-kg lunar landing craft is about to touch down on the surface of the moon, where the acceleration due to gravity is 1.6 m/s2. At an altitude of 158 m the craft's downward velocity is 16.9 m/s. To slow down the craft, a retrorocket is firing to provide an upward thrust. Assuming the descent is vertical, find the magnitude of the thrust needed to reduce the velocity to zero at the instant when the craft touches the lunar surface. In newtons.
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Ethen Stewart
PhysicsPhysics
The bright streak of light we see when a meteoroid enters our atmosphere is caused by

A. radioactive decay of material in the meteoroid.

B. frictional heating as the meteoroid speeds through the gases of our atmosphere.

C. sunlight reflected from the solid body of the meteoroid.

D. a process similar to the aurora that is triggered by the meteoroid's disturbing the Earth's magnetic field.
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Cory Payne
PhysicsPhysics
Which describes Einstein's idea of space and time?

Time and space are relative.

Time and space are absolute.

Time is relative and space is absolute.

Time is absolute and space is relative.
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Donald Bates
PhysicsPhysics
Ian infinite nonconducting sheet has surface charge density on one side. How far apart are equi-potential surfacews whose potentials sdiffer by 50 V?
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Felipe Garza
PhysicsPhysics
A 500 kg car possesses 20000 units of momentum. What would be the cars new momentum if it's velocity was doubled.
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Baylee Mcmahon
PhysicsPhysics
Acar goes from 20m/s to 30m/s in 10 seconds what is its acceleration
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Matias Hays
PhysicsPhysics
Identify at least one way that energy is involved in these situations:

a. An ocean wave at the beach knocks over a sand castle.

b. Your houseplant grows better when it is placed in sunlight.

c. When you eat breakfast in the morning, you have more energy for your school day.

d. When you drop a plate it breaks into pieces.

e. Your hair dryer works when you plug it into an electrical outlet.
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Harley Jackson
PhysicsPhysics
How much heat is absorbed by a 47g iron skillet when its temperature rises from 12oC to 20oC?
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