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4 years ago

Select the correct answer.

Physics

2 answers:

Marrrta [24]4 years ago

5 0

Answer:

Matthew should use the safety glasses as his PPE.

Explanation:

nekit [7.7K]4 years ago

5 0

The answer is E. safety glasses

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A gas has an initial volume of 168 cm3 at a temperature of 255 K and a pressure of 1.6 atm. The pressure of the gas decreases to

denis23 [38]

I do not have a calculator, but let’s think...

Imagine a ballon with a certain amount of gas. When you decrease the volume by squeezing the balloon, you increase the pressure.

Which means volume is inversely proportional to the pressure:
PV=PV

Now to speed things up because class is about to start :/

PV/T=PV/T, I think

Tip: check your units and any questions let me know

5 0

3 years ago

A 12.0-g rock is placed in a slingshot with a spring constant of 200 N/m. The rock is stretched back 0.500 m. After the slingsho

kaheart [24]

The maximum velocity of the rock is 64.55 m/s

Answer: Option B

<u>Explanation:</u>

The possessed energy by the objects while motion called kinetic energy. It is directly proportionate to mass and square of velocity. The stored energy in the system called potential energy and expressed as below,

$\text { potential energy }=\frac{1}{2} \times(\text { spring constant }) \times\left(\text { distance from equilibrium) }^{2}\right.$

$U=\frac{1}{2} \times k \times x^{2}$

U = spring’s potential energy in certain place

k = the spring constant, in N/m.

x = the spring’s distance is stretched or compressed away from equilibrium

Conservation of energy states energy neither created nor destroyed but change from one form to other. So, using this concept, equating both potential and kinetic energies equation we get,

$\frac{1}{2} \times m \times v^{2}=\frac{1}{2} \times k \times x^{2}$

Given:

m = 12 g = 0.012 kg

k = 200 N/m

x = 0.500 m

Substitute these values we get,

$\frac{1}{2} \times 0.012 \times v^{2}=\frac{1}{2} \times 200 \times(0.500)^{2}$

$v^{2}=\frac{200 \times 0.25}{0.012}=\frac{50}{0.012}=4166.66$

Taking square root, we get,

$v=64.55 \mathrm{m} / \mathrm{s}$

7 0

3 years ago

Albert's laboratory is filled with a constant uniform magnetic field pointing straight up. Albert throws some charges into this

guajiro [1.7K]

Answer:

$\vec{F}=qB(v_y \hat{i} - v_x\hat{j})$

Explanation:

The force excerted by a magnetic field on a charged particle is given by the Lorentz force:

$\vec{F} = q \vec{v} \times \vec{B}$

Lets consider the z-direction of our coordinate system the same direction of the magnetic field, that is:

$\vec{B} = B \hat{k}$

Let us consider that the velocity of a given particle is:

$\vec{v} = v_x\hat{i} + v_y \hat{j} + v_z \hat{k}$

Therefore, since k×k = 0

$\vec{v} \times \vec{B} = (v_x\hat{i} + v_y \hat{j} + v_z \hat{k}) \times B\hat{k}\\\vec{v} \times \vec{B} = (Bv_x \hat{i} \times\hat{k}) + (Bv_y \hat{j}\times\hat{k})$

And since i, j , k are a rigth hand system:

i × j = k

j × k = i

k × i = j --> i × k= -j

$\vec{v} \times \vec{B} = Bv_x (-\hat{j}) + Bv_y \hat{i} = Bv_y \hat{i} - Bv_x\hat{j}$

Threfore, if the particle has charge q and velocity v = (vx,vy,vz), the magnetic force it will feel will be

$\vec{F}=qB(v_y \hat{i} - v_x\hat{j})$

4 0

4 years ago

What effect would the incomplete drying of a sample (for example, the incomplete removal of a recrystallization solvent) have on

antiseptic1488 [7]

Answer:

The melting point will be lowered and broadened.

Explanation:

The melting point of a substance is the temperature at which the substance changes state from solid to liquid. The incomplete drying of a sample may result in the presence of impurities. There is presence of solid sample in the solution that fails to dry. The solid sample is not fully crystallized from the solvent or any other liquid with which it can form a true solution. The presence of these impurities in a sample for example, the incomplete removal of a recrystallization solvent cause the melting point to both lowered and broadened.

4 0

3 years ago

After a long night of cramming for a test, your college roommate hits his head forcefully against the wall of your room in despa

sweet [91]

Answer:

See the answer below

Explanation:

Newton's third law states that for every action, there will always be an opposing reaction of equal magnitude to the action.

<em>Hence, the wall will exert an equal opposing force to the head and the roommate will feel this opposing force as pains and/or headache. </em>

3 0

3 years ago