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Elza [17]
2 years ago
6

Children are sled riding on a hill One little girl pulls her sled back up the hill and does 379.5 joules of work while pulling i

t back up the 173 meter hill What amount of force did she exert on the sled?
Physics
1 answer:
Serggg [28]2 years ago
4 0

Answer:

2.2N

Explanation:

Given parameters:

Work done  = 379.5J

Height  = 173m

Unknown:

Amount of force exerted on the sled  = ?

Solution:

The amount of force she exerted on the sled is the same as her weight.

Work done is the force applied to move a body through a distance.

      Work done  = mgh

m is the mass

g is the acceleration due to gravity

h is the height

     mg  = weight;

        Work done  = weight x h

           379.5 = weight  x  173

           weight  = \frac{379.5}{173}   = 2.2N

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A parallel-plate capacitor, with air between the plates, is connected across a voltage source. This source establishes a potenti
kondaur [170]

Answer: 33.5 x 10⁻⁶ C

Explanation:

By definition, the capacitance is the relationship between the charge on one of the plates (assuming it's a capacitor) and the voltage between them:

C = Q / V

Now, it can be showed that we can find the capacitance of a parallel-plate capacitor, taking into account the geometry and the dielectric material only, as follows:

C = ε A /d = ε₀ εr A / d

If the dielectric is air, we can assume εr = 1

If the space between plates is filled with a dielectric of dielectric constant 7.74, the new value for capacitance (regarding the former value) must be 7.74 times larger, as A and d didn't change.

So, in order to produce the same potential difference between the plates, we need to increase the charge, exactly 7.7 times:

Q = 7.7. 4.33 . 10⁻⁶ C = 33.5 . 10⁻⁶ C

8 0
3 years ago
are the two sources in phase or out of phase? explain how you can tell from the diagram. if the two sources are out of phase, gi
pychu [463]

If two sources emit waves with the same wavelength and a constant phase difference ϕ, they are said to be coherent.

<h3>What is coherent source ?</h3>
  • If the frequency and waveform of two wave sources are the same, they are coherent. Waves' optimal quality of coherence makes stationary interference possible.
  • When the phase difference between two beams of light is constant, they are coherent; if the phase difference is random or changes, they are noncoherent.
  • The concept of a superpositioning at the core of quantum physics and quantum computing is referred to as "quantum coherence." Quantum coherence specifically considers a scenario in which a wave property of an item is split in two and the two waves coherently interfere with one another.
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To learn more about coherent refer :

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4 0
1 year ago
A figure skater skates across a rink of length 50 m in 12.1 seconds. a. What is the average speed of the skater? (2 points) b. I
melamori03 [73]
(a) The skater covers a distance of S=50 m in a time of t=12.1 s, so its average speed is the ratio between the distance covered and the time taken:
v= \frac{S}{t}= \frac{50 m}{12.1 s}=4.13 m/s

(b) The initial speed of the skater is
v_i = 4 m/s
while the final speed is
v_f = 5.3 m/s
and the time taken to accelerate to this velocity is t=2 s, so the acceleration of the skater is given by
a= \frac{v_f - v_i}{t}= \frac{5.3 m/s-4.0 m/s}{2.0 s}=0.65 m/s^2

(c) The initial speed of the skater is 
v_i = 13.0 m/s
while the final speed is 
v_f=0
since she comes to a stop. The distance covered is S=8 m, so we can use the following relationship to find the acceleration of the skater:
2aS=v_f^2 -v_i^2
from which we find
a= \frac{-v_i^2}{2S}= \frac{-(13.0m/s)^2}{2 \cdot 8.0 m}=-10.6 m/s^2
where the negative sign means it is a deceleration.
4 0
3 years ago
The flow of electricity in a certain path is called.
JulijaS [17]

The flow of electricity in a certain path is the circuit.

5 0
2 years ago
The name of C (S) + o2 (g) CO2 (g)
USPshnik [31]

Answer:

carbon + oxygen → carbon dioxide

6 0
2 years ago
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