2 years ago

10

Physics

1 answer:

Svetlanka [38]2 years ago

4 0

Answer:

D . A mass of 5 kilograms lifted 5 meters in 10 second

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What happens to the kinetic energy of a body when: a) the mass of the body is doubled at constant velocity? b) the velocity of t

blagie [28]

Using the formula KE=1/2mv^2

a: The kinetic energy doubles.
b: The kinetic energy quadruples.
c: The kinetic energy is cut in half.
Hopefully it’s clear how the formula can show you this.

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3 years ago

1. Choose the correct answer 1. Casparian strips are present in the of the root. a) cortex b) pith c) pericycle d) endodermis 2.

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Answer:

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2 the endarch condition is the character fature of stem.

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2 years ago

An electric furnace is to melt 40 kg of aluminium/hour. The initial temperature of aluminium is 32°C. Given that aluminium has s

gizmo_the_mogwai [7]

Answer:

Part a)

P = 13.93 kW

Part b)

R = 8357.6 Cents

Explanation:

Part A)

heat required to melt the aluminium is given by

$Q = ms\Delta T + mL$

here we have

$Q = 40(950)(680 - 32) + 40(450 \times 10^3)$

$Q = 24624 kJ + 18000 kJ$

$Q = 42624 kJ$

Since this is the amount of aluminium per hour

so power required to melt is given by

$P = \frac{Q}{t}$

$P = \frac{42624}{3600} kW$

$P = 11.84 kW$

Since the efficiency is 85% so actual power required will be

$P = \frac{11.84}{0.85} = 13.93 kW$

Part B)

Total energy consumed by the furnace for 30 hours

$Energy = power \times time$

$Energy = 13.93 kW\times 30 h$

$Energy = 417.9 kWh$

now the total cost of energy consumption is given as

$R = P \times 20 \frac{Cents}{kWh}$

$R = 417.9 kWh\times 20 \frac{cents}{kWh}$

$R = 8357.6 Cents$

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3 years ago

Someone please help me

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The answer is oil and water. If you want I could give you the reason too

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3 years ago

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A child is sliding down a slide at the playground. is the mechanical energy conserved. why or why not.

aleksandrvk [35]

C: the mechanical energy isn't conserved. Some energy was lost to friction.

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2 years ago

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