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larisa86 [58]
3 years ago
12

Select the statement that correctly describes how light travels. (2 points) Select one:

Physics
2 answers:
Sindrei [870]3 years ago
7 0
The correct answer is C - <span>The speed of light, traveling in a vacuum, will not change if the light source is moving. </span>
exis [7]3 years ago
6 0

The correct answer is c

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Electrical Safety: What should you do to a hot plate before turning it on? More than one answer may be correct. Check that the l
solniwko [45]

Answer and Explanation:

Before turning a hot plate on, one should consider these points:

  • Check for the leads and ensure they does not trail in liquid.
  • The cable should be checked for any exposed wire before turning on in order to prevent any shock.
  • Any oil residue should be wiped off of the hot plate to ensure its longevity.
  • It should be placed in a stable place in order to ensure safety against any hazard.
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8 0
3 years ago
How many milliliters of water at 25.0°C with a density of 0.997 g/mL must be mixed with 162 mL of coffee at 94.6°C so that the r
Andre45 [30]

Answer:

The volume of water is 139 mL.

Explanation:

Due to the Law of conservation of energy, the heat lost by coffee is equal to the heat gained by the water, that is, the sum of heats is equal to zero.

Q_{coffee} + Q_{water} = 0\\Q_{coffee} = - Q_{water}

The heat (Q) can be calculated using the following expression:

Q=c \times m \times \Delta T

where,

c is the specific heat of each substance

m is the mass of each substance

ΔT is the difference in temperature for each substance

The mass of coffee is:

162mL.\frac{0.997g}{mL} = 162g

Then,

Q_{coffee} = - Q_{water}\\c_{c} \times m_{c} \times \Delta T_{c} = -c_{w} \times m_{w} \times \Delta T_{w}\\m_{c} \times \Delta T_{c} = -m_{w} \times \Delta T_{w}\\m_{w} = \frac{m_{c} \times \Delta T_{c}}{-\Delta T_{w}} \\m_{w}=\frac{162g \times (62.5 \°C - 94.6 \°C ) }{-(62.5 \°C - 25.0 \°C)} \\m_{w} = 139 g

The volume of water is:

139g.\frac{1mL}{0.997g} =139mL

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4 years ago
In can expermient why the can is chrushed​
schepotkina [342]

Answer:

Force is applied to the point where the can can't handle it and starts to get crushed

Explanation:

5 0
3 years ago
Can someone tell me the answer and the reason
spin [16.1K]

Answer:

(a) the blocks all had different masses.

Explanation:

The surface is smooth, therefore coefficient of friction is tending to zero.

Forces for each blocks varied from 6N to 8N to 7N to 5N

The blocks were made of different materials and different materials are going to have varying weight for the same size of block.

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4 years ago
Most ocean waves obtain their energy and motion from _____. the wind the moon’s gravitational attraction the sun plate movement
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The correct answer is Tectonic plates
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4 years ago
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