Ask question

Ask question

All categories

2 years ago

14

A 450-N rightward force is used to drag a large box across the floor with a constant velocity of 1.2 m/s. The coefficient of fri

ction between the box and the floor is 0.795. Determine the mass of the box.

1 answer:

Nikolay [14]2 years ago

8 0

Answer:

the mass of the box is 51.98 kg.

Explanation:

Given;

applied horizontal force, F = 450 N

coefficient of friction, μ = 0.795

constant velocity, v = 1.2 m/s

At constant velocity, the acceleration of the object is zero and the net force will be zero.

$F_{Net} = F - F_k\\\\0 = F - F_k\\\\F_k = F\\\\\mu \ N = F\\\\\mu (mg) = F\\\\m = \frac{F}{\mu g} \\\\m = \frac{405}{0.795 \ \times \ 9.8} \\\\m = 51.98 \ kg$

Therefore, the mass of the box is 51.98 kg.

You might be interested in

A frog has a pulmocutaneous artery and vein which compares to the human pulmonary artery and vein. What two organs do these bloo

xxTIMURxx [149]

Answer:

Explanation:

Pulmo - lungs

cutan - skin

artery - heart

Frogs breath through their skin oxygenating blood pumped from the heart.

The pulmonary artery connects heart and lungs in humans.

4 0

2 years ago

A boy flying a kite is standing 30 ft from a point directly under the kite. if the string to the kite is 50 ft long, what is the

vagabundo [1.1K]

Draw a diagram to illustrate the problem as shown in the figure below.
h = height of the kite above ground.

By definition, the angle of elevation is
$cos \theta = \frac{30}{50} =0.6$
Therefore
$\theta = cos^{-1} 0.6 = 53.1 \, deg.$

Answer: 53° (nearest integer)

3 0

3 years ago

What is the most significant change in the comet's energy as it moves from

svetoff [14.1K]

The most significant change in the comet's energy as it moves from point D to point A KE increases, GPE decreases.Option C is correct.

<h3>What are comets?</h3>

Comets are frozen leftovers from the formation of the solar system composed of dust, rock, and ice.

They range from a few miles to tens of miles wide, but as they orbit closer to the Sun, they heat up and spew gases and dust into a glowing head that can be larger than a plane.

As the comet transitions from point D to point A, the biggest energy shift is seen. GPE declines as KE rises. The right answer is C.

Hence option C is correct.

To learn more about the comet refer;

brainly.com/question/12443607

#SPJ1

3 0

2 years ago

The parallel plates in a capacitor, with a plate area of 7.10 cm2 and an air-filled separation of 2.20 mm, are charged by a 4.80

Lostsunrise [7]

Answer:

a)14.17V

b)32.8 x $10^-^1^2$ J

c)96.9x $10^-^1^2$ J

d) -64x $10^-^1^2$ J

Explanation:

Given:

Area 'A'=7.10cm² =>7.1 x $10^-^4$ m²

voltage ' $V_o$ '=4.8 volt

$d_o$ = 2.20mm => 2.2 x $10^-^3$ m

$d_1$ = 6.50mm => 6.5 x $10^-^3$ m

a) Capacitance $C_o$ before push is given by:

$C_o$ = εA/ $d_o$ => $\frac{(8.85*10^-^1^2)(7.1*10^-^4)}{2.2*10^-^3}$

$C_o$ = 2.85 x $10^-^1^2$ F

$q_o$ = $C_o$ $V_o$ => 2.85 x $10^-^1^2$ x 4.8

$q_o$ =1.37 x $10^-^1^1$ C

Capacitance $C_1$ after push is given by:

$C_1$ = εA/ $d_1$ => $\frac{(8.85*10^-^1^2)(7.1*10^-^4)}{6.5*10^-^3}$

$C_1$ = 9.66 x $10^-^1^3$ F

$q_o$ = $q_1$

$q_1$ = $C_1$ $V_1$

Therefore, the potential difference between the plates

$V_1$ = 1.37 x $10^-^1^1$ / 9.66 x $10^-^1^3$ =>14.17V

b) $U_i=\frac{1}{2}C_oV_o^2 => \frac{1}{2} (2.85*10^-^1^2)(4.8^2)$

$U_i=$ 32.8 x $10^-^1^2$ J

c) $U_f=\frac{1}{2}C_1V_1^2 => \frac{1}{2} (9.66*10^-^1^3)(14.17^2)$

$U_f$ = 96.9x $10^-^1^2$ J

d) the work required to separate the plates is given by:

workdone= $U_i$ - $U_f$ => 32.8 x $10^-^1^2$ J- 96.9x $10^-^1^2$ J

W≈ -64x $10^-^1^2$ J

6 0

3 years ago

If an air traffic controller is describing the speed of an airplane as well as the direction in which it should begin its dissen

valina [46]

If an air traffic controller is describing the speed of an airplane as well as the direction in which it should begin its dissent, then the air traffic controller is describing the airplane's VELOCITY at that point.

8 0

2 years ago