PLZ HELP!!!!

Physics

2 answers:

WINSTONCH [101]3 years ago

8 0

Answer:

D. Muzzleloaders are always loaded from the muzzle end

Explanation:

Muzzleloading is sports in which muzzleloader are fired. Muzzleloading guns are used for target shooting, hunting, and historical research. It is also used in firearms widely. of all the options in the question the correct statement is

D. Muzzleloaders are always loaded from the muzzle end.

Moreover, muzzleloader are cleaned thoroughly to obtain better accuracy.

FrozenT [24]3 years ago

5 0

I would think the answer is c.

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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

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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.

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

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$Q=c \times m \times \Delta T$

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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,

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