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3 years ago

1.2

2 answers:

5 0

C. Putting a second brick on it

force of friction = mu (coefficient of friction) * normal force

normal force = mass * force of gravity

In order to increase the frictional force, mass must be added to increase the normal force and thus the amount of applied friction.

Alika [10]3 years ago

3 0

Answer:

Explanation:

Because it has to increase

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A motorcycle is following a car that is traveling at constant speed on a straight highway. Initially, the car and the motorcycle

aalyn [17]

Answer:

4.56 s

Explanation:

Let t (seconds) be the time it takes from the moment when the motorcycle starts to accelerate until it catches up with the car. Since prior to this they are traveling at constant speed, they would have maintained a distance of 52 m before accelerating.

The distance traveled by the car, with respect the motorcycle position when it start accelerating is

$s_c = s_0 + v_ct = 52 + 19t$

The distance traveled by the motorcycle after accelerating, with respect the motorcycle position when it start accelerating is

$s_m = v_mt + at^2/2 = 19t + 5t^2/2$

When the motorcycle catches up to the car, their position are at the same

$s_c = s_m$

$52 + 19t = 19t + 5t^2/2$

$52 = 5t^2/2$

$t^2 = 20.8$

$t = \sqrt{20.8} = 4.56 s$

5 0

3 years ago

What is most often given a value of zero to describe an object position on a srtaight line

Vsevolod [243]

Reference point is most often given a value of zero to describe an object's position on a straight line

6 0

3 years ago

An electron and a proton, starting from rest, are accelerated through an electric potential difference of the same magnitude. in

Yakvenalex [24]

The charges are the same in absolute value, so the change of potential energy is the same. That means that the change in kinetic energy is also the same. Then:

1 = Ke/Kp = m_e *v_e^2 / m_p * v_p^2, or

v_e/v_p = sqrt( m_p/m_e),

So the speed of the electron will be sqrt( m_p/m_e) times greater than the speed of the proton

4 0

3 years ago

Will mark brainliest if answer

Anvisha [2.4K]

I won't touch the object because there is a warning sign and that means you stay out if it because it is a danger sign that High Resistance Material that means it is dangerous.

3 0

2 years ago

Two children, Ferdinand and Isabella, are playing with a waterhose on a sunny summer day. Isabella is holding the hose in herhan

sweet [91]

Answer:

84.196%

Explanation:

g = Acceleration due to gravity = 9.81 m/s²

$y_0=1\ m$

x = 10 m

t = Time taken

$v_0$ = 3.5 m/s (assumed, as it is not given)

$A_0$ = $\pi 1.5^2$

We have the equation

$y=y_0+ut+\dfrac{1}{2}gt^2\\\Rightarrow 0=y_0-\dfrac{1}{2}gt^2\\\Rightarrow t=\sqrt{\dfrac{2y_0}{g}}\\\Rightarrow t=\sqrt{\dfrac{2\times 1}{9.81}}\\\Rightarrow t=0.45152\ s$

$x=x_0+vt\\\Rightarrow 10=0+v0.45152\\\Rightarrow v=\dfrac{10}{0.45152}\\\Rightarrow v=22.14741\ m/s$

From continuity equation we have

$Av=A_0v_0\\\Rightarrow A=\dfrac{A_0v_0}{v}\\\Rightarrow A=\dfrac{\pi 1.5^2\times 3.5}{22.14741}\\\Rightarrow A=1.11706\ cm^2$

Fraction is given by

$f=\dfrac{A_0-A}{A_0}\times 100\\\Rightarrow f=\dfrac{\pi 1.5^2-1.11706}{\pi 1.5^2}\times 100\\\Rightarrow f=84.196\ \%$

The fraction is 84.196%

4 0

3 years ago