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3 years ago

Physics help me this is idek

Physics

1 answer:

blagie [28]3 years ago

5 0

Assuming B is a stoping point that means there is acceleration because acceleration is slowing down to a stop, turning around, or speeding up. Now we also know that its speed is decreasing due to the fact that the dots are getting closser to each other. Its only velocity is it tells a direction and speed so that rules out B and C. All you have left is A and D so, you need to figure out which one has acceleration as slowing to a stop and the speed decreasing. (They kind of walk hand in hand.)

I hope that helped you.

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A 500 W immersion heater is placed in a pot containing 1.00 L of water at 20oC. (a) How long will the water take to rise to the

tatiyna

Answer:

96 s.

Explanation:

(a)

From the question,

Q = cm(t₂-t₁)................... Equation 1

Where Q = heat required to boil the water, c = specific heat capacity of the water, m = mass of the water, t₂ = final temperature of water, t₁ = initial temperature of water

Note: The boiling point of water = 100 °C

Given: c = 4200 J/kg.°C, t₂ = 100 °C, t₁ = 20 °C

mass of water = density×volume

m = D×v, Where D = 1000 kg/m³, v = 1.00 L = 0.001 m³

Hence, m = 1000×0.001 = 1 kg.

Substitute into equation 1

Q = 4200×1(100-20)

Q = 4200×8

Q = 33600 J.

But,

P = Q/t................... Equation 2

make t the subject of the equation

t = Q/P................. Equation 3

Where P = power, t = time

From the question,

70 % of the available energy is absorbed by water.

P = 0.7×500 = 350 W.

Substitute into equation 2

t = 33600/350

t = 96 s.

6 0

3 years ago

A proton is placed in an electric field of intensity 700 N/C. What are the magnitude and direction of the acceleration of this p

olya-2409 [2.1K]

Answer:

Acceleration of proton will be $a=0.67\times 10^{11}m/sec^2$

Explanation:

We have given a proton is placed in an electric field of intensity of 700 N/C

So electric field E = 700 N/C

Mass of proton $m=1.67\times 10^{-27}kg$

Charge on proton $e=1.6\times 10^{-19}C$

So electric force on the proton $F=qE=1.6\times 10^{-19}\times 700=1.120\times 10^{-16}N$

This force will be equal to force due to acceleration of the proton

According to newton's law force is given by F = ma

So $1.67\times 10^{-27}\times a=1.120\times 10^{-16}$

$a=0.67\times 10^{11}m/sec^2$

So acceleration of proton will be $a=0.67\times 10^{11}m/sec^2$

6 0

3 years ago

Through how many volts of potential difference must an electron be accelerated to achieve a wavelength of 0.57 nm ?

Alexxandr [17]

We must use two formulas of energy first how energy is related to wavelength:

$E=\frac{hc}{\lambda}$

Such that $\lambda=Wavelength$ , c is the speed of light in a vacuum and h is Plank's constant.

And the second equation is how energy relates to voltage:

$E=qV$

Such that q is the charge of the particle (in this case the electron) and V is voltage. By substituting the second equation into the first we have:

$E=\frac{hc}{\lambda}\\ \\qV=\frac{hc}{\lambda} \\\\V=\frac{hc}{\lambda q}$

We know that:

$c=2.99 \times 10^8 m/s\\\\q=e=1.6 \times 10^{-19} C\\\\h= 6.67 \times 10^{-34} m^2kg/s\\\\\lambda=0.57 \times 10^{-9}m$

And so:

$V=\frac{hc}{\lambda q}=\frac{(6.67 \times 10^{-34})(2.99 \times 10^8)}{(0.57 \times 10^{-9}) (1.60 \times 10^{-19})}$

$V=2186.77 Volts$

4 0

3 years ago

Give me the relationship between frequency and wavelength : (Circle one)

natka813 [3]

Low Frequency= Longer Wavelength

High Frequency= Short Wavelength

3 0

3 years ago

A cylindrical water tank has a height of 20cm and a radius of 14cm. If it is filled to 2/5 of its capacity, calculate.

den301095 [7]

Answer:

Explanation:

Total capacity is

V = πr²h = π(14²)(20) = 12,315 cm³

I. Quantity of water in the tank 12,315(2/5) = 4,926 cm³

II. Quantity of water left to fill the tank to its capacity.

12,315 - 4,926 = 7,389 cm³

12,315(3/5) = 7,389 cm³

5 0

3 years ago

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