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3 years ago

Question 10(Multiple Choice Worth 2 points)

Physics

2 answers:

Sunny_sXe [5.5K]3 years ago

4 0

D. 0.05 kg•m/s

Just multiply the two numbers :)

Please mark brainliest!

Svetach [21]3 years ago

3 0

$P = mv$

P momentum
m mass
v velocity

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To practice Problem-Solving Strategy 25.1 Power and Energy in Circuits. A device for heating a cup of water in a car connects to

Rom4ik [11]

Answer:

It takes <u>951 seconds</u> to boil a cup of water.

Explanation:

Given:

EMF of the battery (E) = 10.0 V

Internal resistance of the battery (r) = 0.04 Ω

Resistance of the circuit = 'R'

Current measured in the circuit (I) = 11.0 A

Energy required to boil water (U) = 100 kJ = 100 × 10³ J [1 kJ = 10³ J]

Time taken for boiling (t) = ?

We know that, the emf of the battery is given as:

$E=I(R+r)$

Plug in the given values and solve for 'R'. This gives,

$10=11(R+0.04)\\\\R+0.04=\frac{10}{11}\\\\R=\frac{10}{11}-0.04=0.909-0.04=0.869\ \Omega$

Now, energy required to boil the water is given as:

$U=I^2Rt$

Plug in the given values and solve for 't'. This gives,

$100\times 10^3\ J=(11.0\ A)^2(0.869\ \Omega)t\\\\t=\frac{100000\ J}{121\times 0.869\ A^2\Omega}\\\\t=\frac{100000\ J}{105.149\ A^2\Omega}\\\\t=951\ s$

So, it takes 951 seconds to boil a cup of water.

5 0

3 years ago

1. Why is the theory that all things are made up of atoms a theory and not a fact?

steposvetlana [31]

Because there is no record of all things. As we have partially unknow information, it can never be held as a fact.

3 0

2 years ago

A 12 oz can of soda is left in a car on a hot day. In the morning the soda temperature was 60oF with a gauge pressure of 40 psi.

Neko [114]

In this case, volume of the can remains constant. The relationship between pressure and temperature at constant volume is given by:

P/T = Constant

Then
$\frac{ P_{1} }{ T_{1} } = \frac{ P_{2} }{ T_{2} }$

Where
P1 = 40 psi
P2 = ?
T1 = 60°F ≈ 289 K
T2 = 90°F ≈ 305 K (note, 363 K is not right)

Substituting;
$P_{2} = \frac{ P_{1} T_{2} }{ T_{1} } = \frac{40*305}{289} =42.21 psi$

3 0

3 years ago

You are performing a double slit experiment very similar to the one from DL by shining a laser on two nattow slits spaced 7.5 x

Blizzard [7]

Complete Question

You are performing a double slit experiment very similar to the one from DL by shining a laser on two nattow slits spaced $7.5 * 10^{-3}$ meters apart. However, by placing a piece of crystal in one of the slits, you are able to make it so that the rays of light that travel through the two slits are Ï out of phase with each other (that is to say, Ao,- ). If you observe that on a screen placed 4 meters from the two slits that the distance between the bright spot closest to center of the pattern is 1.5 cm, what is the wavelength of the laser?

Answer:

The wavelength is $\lambda = 56250 nm$

Explanation:

From the question we are told that

The distance of slit separation is $d = 7.5 *10^{-3} \ m$

The distance of the screen is $D = 4 \ m$

The distance between the bright spot closest to the center of the interference is $k = 1.5 \ cm = 0.015 \ m$

Generally the width of the central maximum fringe produced is mathematically represented as

$y = 2 * k = \frac{ D * \lambda}{d}$

=> $2 * 0.015 = \frac{ \lambda * 4}{ 7.5 *10^{-3}}$

=> $\lambda = 56250 *10^{-9} \ m$

=> $\lambda = 56250 nm$

7 0

3 years ago

Total these measurements. Your answer should indicate the proper accuracy. Be sure to include the units in your answer. (Remembe

vivado [14]

Answer:

Explanation:

This is tough. The last number 0.2 has only one significant figure. So while the sum of all the numbers is 12.3, you must only leave one sig figure. Rounding to the tenths gives 10.

3 0

3 years ago