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Nastasia [14]
3 years ago
5

When a person bends an arm a different muscle is used to bring it back to the original position. why can't the same muscle be us

ed to both bend and unbend the arm?
Physics
1 answer:
Ede4ka [16]3 years ago
8 0
Muscles can only pull not push 

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A student places his hand in front of a plane mirror as shown in
NARA [144]

Answer:

A:

Explanation:

Plane mirrors always form virtual images meaning although the object appears to be in the other side of the mirror the light rays actually originate in front of it. The image is inverted meaning that when you lift your right hand it shows your left hand rising. and with true orientation.

7 0
4 years ago
Suppose that a charged particle of diameter 1.00 micrometer moves with constant speed in an electric field of magnitude 1.00×105
Gnesinka [82]

Answer:

Q1 = 7.25*10^(-16) C 

Explanation:

We are given;

electric field strength = (1 x 10^5 N/C

drag force (F) = 7.25 x 10^(-11) N

The question says it's moving with constant velocity. This means that he particle is in equilibrium and not accelerating.

Columbs law force of attraction or repulsion between two charges is given as;

F=(KQ1Q2)/r²

Now, electric field strength is given as the formula;(K*Q2)/r², thus plugging the relevant values gives us;

7.25 x 10^(-11) N= (1 x 10^(5) N/C)Q1 Q1 = 7.25 x 10^(-11) /(1 x 10^(5))

Q1 = 7.25*10^(-16) C 

5 0
3 years ago
Read 2 more answers
Suppose a distant world with surface gravity of 5.20 m/s2 has an atmospheric pressure of 7.16 ✕ 104 Pa at the surface. (a) What
Nesterboy [21]

Answer:

899752.13598 N

Explanation:

p = Pressure on the plate = 7.16\times 10^4\ Pa

A = Area = \pi r^2=\pi 2^2=\pi 4

F = Force on the region

When force is divided by area we get pressure

p=\frac{F}{A}\\\Rightarrow F=p\times A\\\Rightarrow F=7.16\times 10^4\times \pi 4\\\Rightarrow F=899752.13598\ N

Force is exerted by the atmosphere on a disk-shaped region is 899752.13598 N

6 0
3 years ago
Which best explains how thermal energy is transferred when someone holds a hand above a fire?
Artyom0805 [142]
Heat rises therefore the heat from the fire rises up to your hand... i didnt have any answer choices to work with sorry
5 0
3 years ago
Read 2 more answers
2. What would be the acceleration of the clown at 5 s? (A) 1.6 m/s2 (B) 8.0 m/s2 (C) 2.0 m/s2 (D) 3.4 m/s2 3. After 12 seconds,
Neko [114]
Is there an image that goes with this question?
7 0
2 years ago
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