4 years ago

Which of the following is a scalar quantity?

Physics

1 answer:

aleksandrvk [35]4 years ago

8 0

Answer:

time is a scalar quantity.

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What are four drawbacks to using fossil fuels in Alberta thermal power stations?

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Answer:

Fossil fuels have been used for centuries to generate power, but there are many disadvantages associated with their use:

Fossil fuels pollute the environment.

Fossil fuels are non-renewable and unsustainable.

Drilling for fossil fuels is a dangerous process.

Explanation:

can you help me please? brainly.com/question/21745542

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3 years ago

A 10 g bullet moving horizontally with a speed of 2000 m/s strikes and passes through a 4.0 kg block moving with a speed of 4.2

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Answer:

The answer is "512 J".

Explanation:

bullet mass $m_1 = 10 g= 10^{-2} \ kg\\\\$

initial speed $u_1 = 2\ \frac{Km}{s}= 2000\ \frac{m}{s}\\\\$

block mass $m_2 = 4\ Kg$

initial speed $v_2 =-4.2 \frac{m}{s}$

final speed $v_2= 0$

Let $v_1$ will be the bullet speed after collision:

throughout the consevation the linear moemuntum

$\to M_1V_1+m_2v_2=M_1U_1+m_2u_2\\\\\to (10^{-2} kg) V_1 +0 = (10^{-2} kg)(2000 \frac{m}{s}) + (4 \ kg)(-4.2 \frac{m}{s}) \\\\\ \to 10^{-2} v_1 = 20 -16.8\\\\$

$= 320 \frac{m}{s}$

The kinetic energy of the bullet in its emerges from the block

$k=\frac{1}{2} m_1 v_1^2$

$=\frac{1}{2} \times 10^{-2} \times 320\\\\=512 \ J$

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3 years ago

Write down the symbols of nitrogen and neon?

statuscvo [17]

Answer:

Nitrogen is N, neon is Ne

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What is the definition for the word energy?

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Kinetic, thermal and electrical. There is more then one form of energy

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3 years ago

We can determine the velocity of a wave when given the frequency and the

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Hello.

The answer is: D. wavelength

This is correct because frequency x wavelength = speed

Have a nice day

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