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Lana71 [14]
3 years ago
7

Which electromagnetic waves have the shortest wavelength and the highest frequency?

Physics
1 answer:
ra1l [238]3 years ago
5 0
It’s supposed to be gamma, what are your other options
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A roofer needs to get shingles onto a roof. Pulling the shingles up manually uses 1,549 N or force. The roofer decides to use a
joja [24]

Answer:

Mechanical advantage of pulleys = 3.47 (Approx)

Explanation:

Given:

Manual force = 1,549 N

Pulleys force = 446 N

Find:

Mechanical advantage of pulleys

Computation:

Mechanical advantage of pulleys = Manual force / Pulleys force

Mechanical advantage of pulleys = 1,549 / 446

Mechanical advantage of pulleys = 3.4730

Mechanical advantage of pulleys = 3.47 (Approx)

3 0
4 years ago
A velocity-time graph is shown below: (2 points)
BabaBlast [244]

Answer:

2m/s²

Explanation:

  • V=Vstart+at
  • rewrite that to find a so a=(V-Vstart)/t

part A of graph

  • a=(20m/s–0m/s)/5s
  • a=4m/s²

part B of graph

  • a=(0m/s–0m/s)/5s
  • a=0m/s²

the average between the two is both answers added divided by the number of answers

  • (4m/s²–0m/s²)/2
  • 4m/s²/2
  • 2m/s²
5 0
3 years ago
Air is heated in a glass bottle. The heat energy added to the air is 2.0 × 104 joules. What is the change in internal energy of
Liono4ka [1.6K]
The change in internal energy of the gas is \Delta U = 2.0 \cdot 10^4 J.

In fact, the 1st law of thermodynamics states that the change in internal energy of a system is equal to the amount of heat given to the system (Q) plus the work done on the system (W):
\Delta U = Q+W
In this example, no work is done on the bottle so W=0, while the heat given to the system is Q=2.0 \cdot 10^4 J, so the change in internal energy of the gas is
\Delta U = Q = 2.0 \cdot 10^4 J
4 0
3 years ago
A 4.30 g bullet moving at 943 m/s strikes a 730 g wooden block at rest on a frictionless surface. The bullet emerges, traveling
Ymorist [56]

Answer:

(a)2.7 m/s

(b) 5.52 m/s

Explanation:

The total of the system would be conserved as no external force is acting on it.

Initial momentum = final momentum

⇒(4.30 g × 943 m/s) + (730 g × 0) = (4.30 g × 484 m/s) + (730 g × v)

⇒ 730 ×v = (4054.9 - 2081.2) =1973.7

⇒v=2.7 m/s

Thus, the resulting speed of the block is 2.7 m/s.

(b) since, the momentum is conserved, the speed of the bullet-block center of mass would be constant.

V_{COM} = \frac{m_b}{m_b+m_{bl}}v_{bi}=\frac{4.30}{4.30+730}\times 943 m/s = 5.52 m/s

Thus, the speed of the bullet-block center of mass is 5.52 m/s.

4 0
4 years ago
Please select the word from the list that best fits the definition most destructive kind of mass movement
Alborosie
There is no list but I would say a landslide.
6 0
3 years ago
Read 2 more answers
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