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Nady [450]
3 years ago
12

What is the minimum work needed to push a 920-kg car 310 m up along a 6.5 ∘incline? Ignore friction.Express your answer using tw

o significant figures.
Physics
1 answer:
AVprozaik [17]3 years ago
7 0

Answer:

2800000J

Explanation:

Parameters given:

Mass = 920kg, weight = 920 * 9.8 = 9016N

Distance = 310m

Angle of inclination = 6.5°

Work done is given as :

W = F*d*cosA

Where A = angle of inclination

W = (9016 * 310 * cos6.5)

W = 2776993.59J

In 2 significant figures, W = 2800000J

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A grasshopper jumps straight up at 5.33 m/s. How much time does it take for it to return to earth? If u know please help.
sattari [20]
1) Time to get the highest point of it pathway>

Vf = Vo - g*t

Vf = 0 (condition of maximum height)
Vo = 5.33 m/s
g = 9.81 m/s

=> t = Vo / g = 5.33 m/s / 9.81 m/s = 0.543 s

2) Time to return from the highest point = time to get to the highest point = 0.543 s

Total time = 0.543s + 0.543 s = 1.086 s ≈ 1.09 s

Answer: 1.09 s
5 0
3 years ago
a disk of a radius 50 cm rotates at a constant rate of 100 rpm. what distance in meters will a point on the outside rim travel d
vlabodo [156]

Answer: 50π m ≈ 157 m

Explanation:

100 rev/min (2π rad/rev) / (60 sec/min) = 3⅓π rad/s

d = ωrt = 3⅓π(0.50)(30) = 50π m ≈ 157 m

8 0
3 years ago
Oven cleaner is a highly caustic chemical that reacts with baked on foods. It is dangerous to the touch and has a very slippery
weqwewe [10]
The answer would be (c) above 10 because 4 is basic 5 to seven is also basic and 7 is neutral.
5 0
3 years ago
Read 2 more answers
Anika asks Eva to roll a basketball and then a bowling
Alex73 [517]

Answer:

the bowling ball, because it has more mass and  therefore more inertia

Explanation:

As per law of inertia we know that if an object is having more inertia then it is difficult to change state of motion.

Inertia is the property of mass of an object which always resist to change the state of motion of the object.

If an object has more inertia then it is more difficult to change the state of motion.

Now we know that we have one bowling ball and one basket ball, since bowling ball is having more mass then it must have more inertia so it is difficult to start the motion in bowling ball.

So correct answer will be

the bowling ball, because it has more mass and  therefore more inertia

8 0
3 years ago
Monochromatic light falls on a screen 1.90 m from two slits separated by 2.14 mm. The first- and second-order bright fringes are
r-ruslan [8.4K]

Answer:

625 nm

Explanation:

For constructive interference, the expression is:

d\times sin\theta=m\times \lambda

Where, m = 1, 2, .....

d is the distance between the slits.

The formula can be written as:

sin\theta=\frac {\lambda}{d}\times m ....1

The location of the bright fringe is determined by :

y=L\times tan\theta

Where, L is the distance between the slit and the screen.

For small angle , sin\theta=tan\theta

So,

Formula becomes:

y=L\times sin\theta

Using 1, we get:

y=L\times \frac {\lambda}{d}\times m

For two fringes:

The formula is:

\Delta y=L\times \frac {\lambda}{d}\times \Delta m

For first and second bright fringe,

\Delta m=1

Given that:

\Delta y=0.555\ mm

d = 2.14 mm

L = 1.90 m

Also,

1 mm = 10⁻³ m

So,

\Delta y=0.555\times 10^{-3}\ m

d = 2.14×10⁻³ m

Applying in the formula,

0.555\times 10^{-3}=1.90\times \frac {\lambda}{2.14\times 10^{-3}}\times 1

\lambda=625\times 10^{-9}\ m

Also,

1 m = 10⁹ nm

So wavelength is 625 nm

8 0
3 years ago
Read 2 more answers
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