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4 years ago

7. For a constant force, suppose the duration of

Physics

1 answer:

lara [203]4 years ago

8 0

a. impulse increases by the square of the force.

b. momentum also increases

Explanation:

As we know, force is defined as the product of mass and acceleration of the object. Impulse is nothing but the impulse of an object moving is defined as the integral of all the forces acting on the object.

As we know that force is a vector quantity and hence the impulse. Since impulse is the integral of all the forces. Here, in the question, it is given that the force is doubled then if you integrate then you get a square function. So, the impulse increases by square function.

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In dragons, the allele B produces blue body color. The allele b produces green body color. The B allele is dominant to the b all

Ierofanga [76]

Answer:

Explanation:

Allele B codes for blue colour.

Allele b codes for green colour.

A gene is usually denoted by two alleles and allele B is dominant over allele b. This means that when B and b are together as Bb, blue colouration will be expressed while green colouration will be repressed.

Hence, for the green colouration to be expressed, B must not be present. <em>The genotype therefore must be bb.</em>

3 0

3 years ago

Jack (mass 52.0 kg ) is sliding due east with speed 8.00 m/s on the surface of a frozen pond. he collides with jill (mass 49.0 k

dybincka [34]

We must write down laws of conservation of momenta and energy.
For the law of conservation of momenta will we will use two axes. One will be x-axis that will correspond to the east, and the other one will be y-axis corresponding to the north. Jack will be marked as 1 and Jill will be marked as 2.
Law of conservation of energy:
$\frac{m_1v_1^2}{2}=\frac{m_1v'_1^2}{2}+ \frac{m_2v_2^2}{2}\\
m_2v_2^2=m_1v_1^2-m_1v_1'^2\\
v_2=\sqrt{\frac{m_1v_1^2-m_1v_1'^2}{m_2}$
This will give us Jill's velocity after the colision.
$v_2=6.43\frac{m}{s}$
Law of conservation of momenta:
$x: m_1v_1=m_1v_1'cos(34)+m_2v_2cos(\theta)\\
y: 0=m_1v_1'sin(34)-m_2v_2sin(\theta)\\$
We will use the second equation to get the angle at which the Jill is traveling:
$0=m_1v_1'sin(34)-m_2v_2sin(\theta)\\
m_2v_2sin(\theta)=m_1v_1'sin(34)\\
sin(\theta)=\frac{m_1v_1'sin(34)}{m_2v_2}\\
\theta=sin^{-1}(\frac{m_1v_1'sin(34)}{m_2v_2})$
When we plug all the number we get:
$\theta=27.45^\circ$
Please note that this is the angle below the x-axis.

6 0

3 years ago

What is heat?

alina1380 [7]

Answer:

Heat is the energy that flows between two substances of different temperatures.

Explanation:

Heat is a type of energy in transition that is transferred by non-mechanical means between systems, which means that it is energy that is transferred (or that <u>flows </u>) from one system to another.

This flow of energy occurs due to a temperature difference, and heat will flow from the system or substance with a higher temperature to the substance with a lower temperature, and if kept in contact they will eventually reach the thermal equilibrium.

So the correct answer is: Heat is the energy that flows between two substances of different temperatures.

3 0

3 years ago

Read 2 more answers

Why is an electromagnet used instead of a permanent magnet in magnetic cranes?

natali 33 [55]

Answer:

an electromagnet is a metal which has the ability to turn into a magnet on passing electricity through it .

But once the electric flow is withdrawn the circuit breaks and it no more behaves like a magnet.

but this is not so in permanent magnets

Explanation:

thus electromagnet is used in magnetic cranes bcoz their magnetism can be controlled conveniently.

8 0

3 years ago

Read 2 more answers

A shopping cart is given an initial velocity of 2 m/s and undergoes a constant acceleration of 4 m/s2. What is the magnitude of

Rasek [7]

Answer:

84 meters

Explanation:

Using these two kinematic equations : Vf= Vi +at and

D= [(Vi+Vf)/2]*t

Plugging in what we know into the first equation to solve for the Final velocity, you'll get Vf= 2 m/s + 4(m/s^2)*6s = 26m/s

plug time vi and vf into the second equation to solve for displacement.

6 0

3 years ago