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

2 answers:

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.
Thus all the above mentioned points are correct to ensure safety.

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,

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