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Sergio039 [100]
2 years ago
9

When an object is raised vertically, work is done against __________. What one word completes the sentence?

Physics
1 answer:
Rasek [7]2 years ago
7 0
Gravity Gravitational Force of Gravity
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Bacterial cells are microscopic. What do you think has happened so that after only a few days we can see a colony of bacteria on
wariber [46]
The startling answer is:

The bacteria ate the agar and reproduced (made more bacteria). There are so many of them now that you can see the blob of them.
5 0
3 years ago
Juri is tugging her wagon behind her on the way to... wherever her wagon needs to go. The wagon repair shop. She has a trek ahea
vitfil [10]

Answer:

W = 819152 J = 819.15 KJ

Explanation:

The work done by Juri can be given by the following formula:

W = FdCos\theta

where,

W = Work done = ?

F = Force = 200 N

d = distance = 5 km = 5000 m

θ = angle to horizontal = 35°

Therefore,

W = (200 N)(5000 m)Cos 35°

<u>W = 819152 J = 819.15 KJ</u>

5 0
2 years ago
What happens to the magnitude of the momentum of an object if the mass of the object halved?<br>​
nekit [7.7K]

Answer:

Momentum is directly proportional to velocity. If momentum of an object is doubled , but its mass does not increase (so velocity remains below the speed of light) then its velocity is doubled. If the velocity is doubled, then the kinetic energy increases by four times.

Explanation:

Hope it is helpful....

8 0
2 years ago
A diode laser emits a wavelength of 987 nm. All of its output energy is absorbed in a detector that measures a total energy of 0
Goshia [24]

Answer:

8.04 × 10¹⁶ photons per second

Explanation:

First, we calculate the energy per photon from E = hc/λ where h = Planck's constant = 6.63 × 10⁻³⁴ Js c = speed of light = 3 × 10⁸ m/s and λ = wavelength of laser = 987 nm = 987 × 10⁻⁹ m = 9.87 × 10⁻⁷ m

So, E = hc/λ = 6.63 × 10⁻³⁴ Js × 3 × 10⁸ m/s/9.87 × 10⁻⁷ m = 19.89/9.87 × 10⁻¹⁹ J = 2.02 × 10⁻¹⁹ J per photon.

Since we have a total of 0.52 J over a period of 32 s, the output power is 0.52 J/32 s = 0.0163 J/s.

Thus the total number of photons per second is thus in output power/energy per photon = 0.0163 J/s ÷ 2.02 × 10⁻¹⁹ J per photon

= 8.04 × 10¹⁶ photons per second

6 0
3 years ago
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