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Ket [755]
2 years ago
12

A person is pushing a fully loaded 21.60 kg wheelbarrow at constant velocity along a plank that makes an angle ????=20.0∘ with t

he horizontal. The load is distributed such that the center of mass of the wheelbarrow is exactly halfway along its length L. What is the magnitude of the total force Fx the person must apply so that the wheelbarrow is parallel to that plank? You may neglect the radius of the wheel in your analysis. The gravitational acceleration is g=9.81 m/s2.
Physics
1 answer:
erica [24]2 years ago
4 0

Answer:

Explanation:

The weight of the wheelbarrow will act downwards . Its component parallel to the plank will act downwards along the plank .

The value of component = mgsinθ

21.6 x 9.8 x sin20

= 72.4 N

The person shall have to apply force equal to this component so that the barrow moves with uniform velocity.

Force required = 72.4 N .

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Oksi-84 [34.3K]

Answer:

The number of electrons is 6.3\times10^{21}\ electrons

(D) is correct option.

Explanation:

Given that,

Battery capacity = 750 mA-h

Time t= 8 hours

Time t'=3 hours

We need to calculate the battery capacity

Battery\ capacity=750\times10^{-3}\times3600

Battery\ capacity=2700\ A-s

We need to calculate the number of electrons in 1 C Li

Using formula for number of electron

n=\dfrac{1}{e}

n=\dfrac{1}{1.6\times10^{-19}}

n=6.25\times10^{18}\ electrons

We need to calculate the number of electron in 2700 C

2700\ C=2700\times6.25\times10^{18}=1.68\times10^{22}\ electrons

The total number of electrons battery can deliver in 8 hours

n=1.68\times10^{22}\ electrons

We need to calculate the number of electron in 3 hours

Using formula of number of electrons

n=\dfrac{n\times t'}{t}

Put the value into the formula

n=\dfrac{1.68\times10^{22}\times3}{8}

n=6.3\times10^{21}\ electrons

Hence, The number of electrons is 6.3\times10^{21}\ electrons

8 0
2 years ago
Read 2 more answers
What two factors determine the energy production of the Hoover Dam
swat32
Mar 28, 2011 · The Hoover Dam generates electricity using hydropower. Hydropower is the power generated by moving water. Dams are often built on a large river, so the water falls down from the top of the dam. At the bottom of the dam, the water rotates a large turbine

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6 0
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A tennis ball is shot vertically upward in an evacuated chamber inside a tower with an initial speed of 20.0 m/s at time t=0s. W
dalvyx [7]

Answer:

at the highest point of the path the acceleration of ball is same as acceleration due to gravity

Explanation:

At the highest point of the path of the ball the speed of the ball becomes zero as the acceleration due to gravity will decelerate the motion of ball due to which the speed of ball will keep on decreasing and finally it comes to rest

So here we will say that at the highest point of the path the speed of the ball comes to zero

now by the force diagram we can say that net force on the ball due to gravity is given by

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5 0
1 year ago
Calculate the density of mercury if 500 cm3
notka56 [123]

Answer:

The density of the mercury is 13.2 g/cm³

Explanation:

Density is a measurement that compares the amount of matter an object

has to its volume

Density is equal to mass divided by volume

We need to find the density of mercury if 500 cm³ has a mass of

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We must to change The kilogram to grams

The mass of mercury is 6.60 kilograms

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The density = 6600 ÷ 500

The density = 13.2 g/cm³

<em>The density of the mercury is 13.2 g/cm³ </em>

5 0
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When balancing an assembly line, which of the following is not a way to reduce the longest task time below the required workstat
tiny-mole [99]

Answer:

D. Speed up the assembly line transfer mechanism

Explanation:

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6 0
2 years ago
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