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Physics

Parker Holden

Which is an example of speed?

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Physics

Guest

A very small object with mass 6.90 * 10^-9 kg and positive charge 8.30 * 10^-9 C is projected directly toward a very large insulating sheet of positive charge that has uniform surface charge density 5.90 x 10^-8 C/m^2. The object is initially 0.530 m from the sheet.

What initial speed must the object have in order for its closest distance of approach to the sheet to be 0.170 m?,

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Physics

Mireya Mcintosh

How to find the energy of a wave

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Physics

Gerardo

You are explaining why astronauts feel weightless while orbiting in the space shuttle. Your friends respond that they thought gravity was just a lot weaker up there. Convince them and yourself that it isn't so by calculating the acceleration of gravity 248 km above the Earth's surface in terms of g. (The mass of the Earth is 5.97 1024 kg, and the radius of the Earth is 6380 km.)

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Physics

Roy

What is the half life of each of these radioactive isotopes?

a radioactive isotope decreased to one-fourth its original amount in 18 months.

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Physics

Payten Goodwin

What would be the most likely charge of an ion formed from an atom with the electron configuration:

1s22s22p5

+1

-1

+3

-3

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Physics

Mariah Woodward

How many degrees is in the centre of the sun

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Physics

Howard Greer

How to write 0.23000 in scientific notation

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Physics

Kamron Torres

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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Physics

Salty

A prototype shows if a product meets the required needs.

True

False

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Physics

Cynthia Benson

Who discovered black hole radiation?

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Physics

Jessie Graham

You catch, tag, and release 50 fish back into a pond. Then, you catch 25 more fish, 5 of which are tagged. What is the best estimate of the number of fish in the pond?

A. 100 fish

B. 250 fish

C. 400 fish

D. 625 fish

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Physics

Aspen Browning

Which statement correctly describes the differences between positive and negative acceleration? Positive acceleration describes a change in speed; negative acceleration describes no change in speed. Positive acceleration describes no change in speed; negative acceleration describes a change in speed. Positive acceleration describes an increase in speed; negative acceleration describes a decrease in speed. Positive acceleration describes a decrease in speed; negative acceleration describes an increase in speed.

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Physics

Gary Valdez

The light-producing element in a fluorescent bulb is the

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Physics

Elliott Stone

an object travels in circular motion with a speed of 11.40 m/s. What is the centripetal acceleration if the radius of the circle is 5.52 m?

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