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4 years ago

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With its wheels locked, a van slides down a hill inclined at 40.0° to the horizonta l. Find the acceleration of this van A) if t

he hill is icy and frictionless, and B) if the coefficient of kinetic friction is 0.20.

1 answer:

andreyandreev [35.5K]4 years ago

7 0

Answer:

Explanation:

Check attachment for solution

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Forces can be________. What phrase completes the sentence.

koban [17]

Answer:

pushes or pulls

Explanation:

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3 years ago

A solenoid 1.39 m long and 3.20 cm in diameter carries a current of 17.1 A. The magnetic field inside the solenoid is 26.9 mT. F

Mariulka [41]

Explanation:

It is given that,

Length of the solenoid, l = 1.39 m

Diameter of the solenoid, d = 3.2 cm = 0.032 m

Radius of solenoid, r = 0.016 m

Magnetic field inside the solenoid, $B=26.9\ mT=26.9\times 10^{-3}\ T$

We need to find the length of the wire forming the solenoid. The magnetic field inside the solenoid is given by :

$B=\mu_o nI$

n is number of turns per unit length

$B=\dfrac{\mu_o NI}{l}$

$N=\dfrac{Bl}{\mu_o I}$

$N=\dfrac{26.9\times 10^{-3}\times 1.39}{4\pi \times 10^{-7}\times 17.1}$

N = 1740.04

The total length having N loop is,

$L=2\pi r\times N$

$L=2\pi \times 0.016\times \times 1740.04$

L = 174.92 m

So, the length of the wire forming the solenoid is 174.92 meters. Hence, this is the required solution.

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4 years ago

A ball drops some distance and gains 30 J of kinetic energy. How much gravitational potential energy did the ball start with? Do

Dovator [93]

Answer:

The gravitational potential energy of the ball is more than 30 J.

Explanation:

Given that,

Gains kinetic energy = 30 J

We need to calculate the gravitational potential energy

According to law of conservation of energy

If there is no air resistance then the potential energy of the ball fully converted into kinetic energy.

If the air resistance is considered then the potential energy used to do work against air resistance.

$\Delta U\geq \Delta K.E$

According to question,

A ball drops some distance and gains 30 J of kinetic energy and considers air resistance then 30 J of potential energy can be loosed by the ball.

Hence, The gravitational potential energy of the ball is more than 30 J.

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3 years ago

WHAT IS COMPUTER ? EXPLAIN IT .

Alenkinab [10]

Answer: it's an electronic device

Explanation: it's where you store and process data, it acts according to the instructions given to it in a variable program.

Sorry if this wasn't the answer you were looking for.

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4 years ago

What are the magnitudes of (a) the angular velocity, (b) the radial acceleration, and (c) the tangential acceleration of a space

KonstantinChe [14]

Answer:

$(a)w=2.485*10^{-3}m/s\\(b)a=26.92m/s^2\\(c)\alpha =0rad/s^2$

Explanation:

Given data

Linear speed of spaceship V=39000 km/h =10833.3 m/s

The radius of circular motion r=4360 km=4360000 m

For Part (a) angular velocity

The angular velocity is given by:

$w=\frac{v_{speed}}{r_{radius}}$

Substitute the given values

So

$w=\frac{10833.3m/s}{4360000m} \\w=2.485*10^{-3}m/s$

For Part(b) The radial acceleration of spaceship

The radial acceleration is given by:

$a_{r}=w^2 r$

Substitute given values and value of ω

So

$a_{r}=(2.485*10^{-3}m/s)^2(4360000m)\\a_{r}=26.92m/s^2$

For Part (c) The tangential acceleration

The spaceship is rotating with constant angular velocity,then the tangential acceleration of spaceship is zero

So

$\alpha =0rad/s^2$

4 0

3 years ago