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4 years ago

PLEASE HELP I can't figure it out

Physics

1 answer:

PSYCHO15rus [73]4 years ago

4 0

D. I know that like the back of my hand

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In the demolition of an old building, a 1,300 kg wrecking ball hits the building at 1.07 m/s2

goldfiish [28.3K]

Answer:

Explanation:

TRUST ME AND I AM SORRY IF RONG

5 0

3 years ago

A 58.4-kg person, running horizontally with a velocity of +3.97 m/s, jumps onto a 14.8-kg sled that is initially at rest. (a) Ig

AURORKA [14]

Answer:0.017

Explanation:

Given

mass of person $m_1=58.4 kg$

mass of sled $m_2=14.8 kg$

velocity of person $v_1=3.97 m/s$

let u be the combined velocity of person and sled

conserving momentum

$m_1v_1=(m_1+m_2)u$

$u=\frac{m_1}{m_1+m_2}\times v_1$

$u=\frac{58.4}{58.4+14.8}\times 3.97$

$u=3.16 m/s$

(b)Total distance traveled by sled and man is 30 m

deceleration Provided by surface is $\mu _k\cdot g$

where $\mu _k$ is coefficient of kinetic friction

using $v^2-u^2=2as$

$0-3.16^2=2(-\mu _k\cdot 9.8)\cdot 30$

$\mu _k=0.0169$

6 0

4 years ago

Displacement vector points due east and has a magnitude of 3.35 km. Displacement vector points due north and has a magnitude of

tekilochka [14]

Answer:

(a) 6.56 km

(b) $59.68^\circ$ north of west

Explanation:

Given:

$\vec{d}_1= 3.35\ km\ east = 3.35\ km\ \hat{i}\\\vec{d}_2= 9.31\ km\ north = 9.31\ km\ \hat{j}\\\vec{d}_3= 6.66\ km\ west = -6.61\ km\ \hat{i}\\\vec{d}_4= 3.65\ km\ south = -3.65\ km\ \hat{j}\\$

Let the resultant displacement vector be $\vec{D}$ .

As the resultant is the vector sum of all the vectors.

$\therefore \vec{D}=\vec{d}_1+\vec{d}_2+\vec{d}_3+\vec{d}_4\\\Rightarrow \vec{D} =(3.35\ km\ \hat{i})+(9.31\ km\ \hat{j})+(-6.61\ km\ \hat{i})+(-3.65\ km\ \hat{j})\\\Rightarrow \vec{D} =-3.31\ km\ \hat{i}+5.66\ km\ \hat{j}\\\textrm{Magnitude of the resultant displacement vector} = \sqrt{(-3.31)^2+(5.66)^2}\ km= 6.56\ km\\$

$\textrm{Angle with the positive west} = \theta = \tan^{-1}(\dfrac{5.66}{3.31})= 59.68^\circ$

7 0

4 years ago

The water passing over victoria falls, located along the zambezi river on the border of zimbabwe and zabia drops about 105 m. Ho

7nadin3 [17]

Answer:

1029 Jkg⁻¹

Explanation:

$h$ = height dropped by the water falling = 105 m

$g$ = acceleration due to gravity = 9.8 ms⁻²

$m$ = mass of water

Using conservation of energy, the internal energy produced is same as the gravitational potential energy lost, hence

Internal energy = Gravitational potential energy

$U = mgh \\\frac{U}{m} = gh\\\frac{U}{m} = (9.8) (105)\\\frac{U}{m} = 1029 Jkg^{-1}$

7 0

3 years ago

I need help!!!!!!!!! Somebody please help me!!!!!!!!!!!!!

konstantin123 [22]

Voltage, measured in volts (V), is a measure of how much energy is given to the moving electrons in a circuit. Another way of thinking of voltage is by analogy with the pressure that pushes water through the pipes in a house.

8 0

3 years ago