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3 years ago

14

Could you please explain to me Newton's second law of motion? Please I don't get it :/

1 answer:

MissTica3 years ago

8 0

Answer:

Newton's second law states that when a body of mass m is accelerated with force f

then F=ma

this means acceleration of an object depends on both force with which it is moving as well as its mass

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The band gab of semi conductor?

Lerok [7]

Answer:

Properties of semiconductors are determined by the energy gap between valence and conduction bands. To understand, what is semiconductor, we have to define these terms. In solid-state physics, the energy gap or the band gap is an energy range between valence band and conduction band where electron states are forbidden.

8 0

3 years ago

What is a hypothesis answer sentence for a lemon battery experiment

sergij07 [2.7K]

The lemon battery hypothesis states that a lemon is acidic enough to carry an electric charge and act as a battery.

6 0

3 years ago

A boat, the speed of which is 10 m.s-1 relative to the water, sails downstream at an angle of 60 degrees, with the flow of the r

Tems11 [23]

Answer:

resultant velocity of boat will be 11.2249 m/sec

Explanation:

We have given speed of boat $v_b$ = 10 m /sec

Velocity pf current flow $v_c$ = 4 m /sec

Angle at which boat is moving = 60°

We have to find the resultant velocity

We know that resultant velocity is given by $v_r=\sqrt{v_b^2+v_c^2+2v_bv_rcos\Theta}=\sqrt{10^2+4^2+2\times 10\times 4cos60^{\circ}}=11.2249m/sec$

So resultant velocity of boat will be 11.2249 m/sec

4 0

3 years ago

A merry-go-round can be modeled as a solid disk of radius R and mass M. Initially, it is rotating on a sturdy frictionless axle

Crazy boy [7]

Answer:

w = w₀ M / (M + 2m)

Explanation:

This exercise can be solved using the concepts of conservation of angular momentum

L = I w

Let's write in angular momentum in two points

Initial. Before impact

L₀ = I w₀

Final. After the rock has stuck

$L_{f}$ = I w + (m r²) w

The system is formed by the disk and the rock, so that the forces and moments during the crash are internal and the angular momentum is preserved

L₀ = $L_{f}$

I w₀ = (I + m r²) w

w = w₀ I / (I + m r²)

The roundabout is a disk so its moment of inertia is

I = ½ M r²

w = w₀ ½ Mr² / (½ M r² + mr²)

w = w₀ ½ M / (½ M + m)

w = w₀ ½ M2 / (M + 2m)

w = w₀ M / (M + 2m)

3 0

3 years ago

10 points) A rubber ball and a lump of putty of the same mass m = 0.05 kg are thrown with the same speed v=10.0 m/s in positive

snow_lady [41]

Answer:

the ball experiences the greater momentum change

Explanation:

You have to take into account that momentum change is given by

$\Delta p=mv_f-mv_b$

where vf and vb are the speed of the object after and before the impact.

In the case of the ball you have

$\Delta p=(0.05kg)(-10.0\frac{m}{s})-(0.05kg)(10.0\frac{m}{s})=-1kg\frac{m}{s}$

where the minus of vf is included due to the motion is in an opposite direction regarding with vb

And for the lump

$\Delta p=(0.05kg)(10.0\frac{m}{s})-(0.05kg)(0\frac{m}{s})=0.5kg\frac{m}{s}$

Hence, the ball experiences the greater change

hope this helps!!

4 0

3 years ago