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4 years ago

Two things you can do to increase the acceleration of an object

Physics

1 answer:

stiv31 [10]4 years ago

7 0

You can decrease the mass, or you can increase the force applied to the object

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Physics !!!!!!!!!!!!!!!!!

madreJ [45]

Answer:

1) v = -0.89 m/s

2) v = 36.5 m/s

Explanation:

1) Given

The mass of the boy, M = 45 Kg

The mass of the skateboard, m = 2 Kg

The initial velocity of the boy and skateboard is zero

According to the law of conservation of linear momentum

MV + mv = 0

V = - mv/M

Substituting the given values in the above equation

V = -2 x 20/ 45

= -0.89 m/s

Hence, the velocity of the boy, v = -0.89 m/s

2) Given

The mass of the boy, M = 47 Kg

The mass of the skateboard, m = 8 Kg

The initial combined velocity of the boy and skateboard, u = 4.2 m/s

The boy jumped off from the skateboard with velocity, V = -1.3 m/s

According to the law of conservation of momentum,

MV + mv = (M + m)u

v = [(M + m)u - MV] / m

Substituting the given values,

v = [(47 + 8)4.2 - 47(-1.3)] / 8

= 36.5 m/s

Hence, the velocity of the skateboard, v = 36.5 m/s

3 0

4 years ago

When is thermal equilibrium achieved between two identical objects?

Sindrei [870]

The answer is C hope this helps <span />

3 0

3 years ago

3. A bicycle has a momentum of 25.00 kg* m/s and a velocity of 2.5 m/s . What is the bicycle's

Anna35 [415]

Answer:

10 kg

Explanation:

The question is most likely asking for the mass of the bicycle.

Momentum is the product of an object's mass and velocity. Mathematically:

p = m * v

Where p = momentum

m = mass

v = velocity

Hence, mass is:

m = p / v

From the question:

p = 25 kgm/s

v = 2.5 m/s

Mass is:

m = 25 / 2.5 = 10 kg

The mass of the bicycle is 10 kg.

In case the question requires the Kinetic energy of the bicycle, it can be gotten by using the formula

K. E = ½ * p * v

K. E. = ½ * 25 * 2.5 = 31.25 J

5 0

4 years ago

The mass number of Fe2+ is 56. How many neutrons are there in a single Fe2+ atom?

bonufazy [111]

<span>The atomic number of a neutral atom is equal to the number of protons and the number of electrons of the atom. The atomic weight meanwhile is equal to the sum of the number of protons and number of neutrons. In this case, the number of protons is equal to 26. The number of neutrons hence is 30. </span>

7 0

3 years ago

Read 2 more answers

The magnetic force on a charged moving particle: a) depends on the sign of the charge on the particle.b) depends on the magnetic

Marysya12 [62]

Answer:

All of the statements are correct

Explanation:

Hello!

All of the statements are rigth. You can know this by examining the Lorentz Force:

$\vec{F} = q \vec{v} \times \vec{B}$

a )

The dependence on the charge sign can be inferrend by the term q which is the particle's charge. If it changes sign, the force also does.

Although we usually deal with constant magntic Fields, they could also be position dependent, for example the magnetic field of a wire. The fild of teh force will also inherit this position dependence, that is:

$\vec{F}(\vec{x}) = q \vec{v} \times \vec{B}(\vec{x})$

Again, from the equation of the force or Lorentz force, we can see that this statement is true.

The validity of this statement is given by the cross product between the velocity (which points twoards the direction of motion of the particle) and the magnetic field

5 0

4 years ago