4,347 Answered Questions for the topic Science

12/10/20

 What is the current?
A lightning stroke lasts 0.03 s and involves a flow of 106 C.A lightning stroke lasts 0.03 s What is the current?
Follows • 1
Expert Answers •1

12/10/20

Physics Conservation of Momentum
A red ball with a mass of 5 kg sits at rest on the gym floor. YOU roll a blue ball, with a mass of 20 kg, into the red ball. This blue ball is moving at 2 m/s before the collision. After the... more
Follows • 1
Expert Answers •1
Science Math Physics Maths

12/10/20

Could somebody please help, I don't even know where to start with this. Please explain your answers to me, it would help me a lot
Two masses (m1 = 2.0 kg, m2 = 4.0 kg) are each initially 2.0 m above the table, and the masslessfrictionless pulley is 6.0 m above the table.(a) What’s the acceleration of the mass 2?(b) What’s the... more
Follows • 3
Expert Answers •2

12/09/20

How much energy does it use in 50 min?
An electric clothes dryer is rated at 2,900 W. How much energy does it use in 50 min?
Follows • 2
Expert Answers •1

12/09/20

What is its power consumption when the current flowing through the train's motor is 1,970 A?
An electric train operates on 875 V. What is its power consumption when the current flowing through the train's motor is 1,970 A?
Follows • 1
Expert Answers •2

12/09/20

What is the eel's power output?
An electric eel can generate a 463-V, 0.4-A shock for stunning its prey. What is the eel's power output?
Follows • 1
Expert Answers •1

12/09/20

What is the heater's resistance?
A current of 25.5 A flows through an electric heater operating on 220 V. What is the heater's resistance?
Follows • 1
Expert Answers •2

12/09/20

What is the current?
A lightning stroke lasts 0.03 s and involves a flow of 106 C. What is the current?
Follows • 1
Expert Answers •1

12/09/20

Which one is correct? I have two different answers to the question: Is the number of particles per mole dependent on the kind of atom/element? Why or why not?
No, because the number of particles per mole is measured by the Avogadro Number. This means that one mole of any substance is equal to 6.022 × 10²³. Although the number of particles per mole is not... more
Follows • 2
Expert Answers •2

12/09/20

Name at least three targets molecules that get phosphorylated
Name at least three targets molecules that get phosphorylated by mitotic Cdk after its activation by the appropriate cyclin at the onset of mitosis (prophase)Then, describe the specific changes in... more
Follows • 1
Expert Answers •1

12/09/20

What are the two major mechanisms through which cell signaling leads to a change in cell behavior?
What are the two major mechanisms through which cell signaling leads to a change in cell behavior?
Follows • 1
Expert Answers •1

12/09/20

How would you expect intracellular signaling to be altered in cells that have been infected with cholera compared to non-infected cells?
How would you expect intracellular signaling to be altered in cells that have been infected with cholera compared to non-infected cells?
Follows • 1
Expert Answers •1

12/09/20

During 42 seconds of use, 210 C of charge flow through a microwave oven. Compute the size of the electric current.
During 42 seconds of use, 210 C of charge flow through a microwave oven. Compute the size of the electric current.
Follows • 1
Expert Answers •1

12/09/20

How many 2,300-W appliances can be plugged into the sockets without blowing the fuse?
All of the electrical outlets in a room are connected in a single parallel circuit. The circuit is equipped with a 20-A fuse, and the voltage is V = 120 V.What is the maximum total power that can... more
Follows • 1
Expert Answers •2
Science Chemistry

12/08/20

The first-order isomerization reaction: cyclopropane → propene, has a rate constant of 1.1 × 10-4 s-1 at 470°C and an activation energy of 264 kJ/mol.
What is the temperature of the reaction when the rate constant is equal to 4.36 × 10-3 s-1?
Follows • 2
Expert Answers •1

12/08/20

How many coulombs of charge flow through it during that time?
A current of 0.3 A goes through an electric motor for 5 min. How many coulombs of charge flow through it during that time?
Follows • 1
Expert Answers •1

12/08/20

The resistance of each brake lightbulb on an automobile is 7.0 Ω.

The resistance of each brake lightbulb on an automobile is 7.0 Ω.Cars have 12-V electrical systems to compute the current that flows in each bulb if they are connected in series. (For simplicity,... more
Follows • 1
Expert Answers •1
Science Chemistry

12/08/20

Please help with this question, I would appreciate if you could explain your work where it needs explaining.
What is the molality of acetone in a solution composed of 255 g of acetone, (CH3)2CO, dissolved in 200 g of water?
Follows • 2
Expert Answers •1

12/07/20

 What is the speed of sound in neon?
A 530-Hz sound travels through pure neon. The wavelength of the sound is measured to be 0.82 m. What is the speed of sound in neon?
Follows • 1
Expert Answers •3

12/07/20

What frequency of sound traveling in air at 20°C has a wavelength equal to 1.8 m, the average height of a person?
What frequency of sound traveling in air at 20°C has a wavelength equal to 1.8 m, the average height of a person?
Follows • 2
Expert Answers •1

12/07/20

What is the size of the smallest feature observable in human tissue when examined with 19-MHz ultrasound?
Ultrasound probes can resolve structural details with sizes approximately equal to the wavelength of the ultrasound waves themselves. What is the size of the smallest feature observable in human... more
Follows • 1
Expert Answers •1

12/07/20

How far away are the fish?

A sound pulse emitted underwater reflects off a school of fish and is detected at the same place 0.25 s later (see the figure below). How far away are the fish? (Assume the water temperature is 20°C.) more
Follows • 1
Expert Answers •1

12/07/20

Approximately how many times louder is the latter sound?
The sound level measured in a room by a person watching a movie on a home theater system varies from 45 dB during a quiet part to 65 dB during a loud part. Approximately how many times louder is... more
Follows • 1
Expert Answers •1

12/07/20

Which of the following are waves that can travel without a medium?
Which of the following are waves that can travel without a medium? visible lightseismic waveswaves on a lakesound wavesx-raysradio waves
Follows • 1
Expert Answers •1

12/06/20

How much time elapses between the instant the fan sees a batter hit the ball and the moment the fan hears the sound?

A baseball fan sitting in the "cheap seats" is d = 122 m from home plate. How much time elapses between the instant the fan sees a batter hit the ball and the moment the fan hears the sound?... more
Follows • 1
Expert Answers •1

Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.

OR

Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.