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3 years ago

A rock is dropped from a tall bridge and hits the water below in 2.9

Physics

1 answer:

Ahat [919]3 years ago

3 0

Answer:

The height of the bridge is 14.5

Explanation:

Given the following data

t = 2.9 seconds

g = +10m/s^2

Using the below formula

H = ut + 1/2gt^2

Since the initial velocity u = 0

Then, H = 1/2gt^2

H = 1/2 x 2.9 x 10

H = 2.9 x 10 / 2

H = 2.9 x 5

H = 14.5

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If a load of 5 kg covers a distance of 50m in 2 min, what is the power? (g=10m/s)

eduard

Explanation:

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2 years ago

A long, thin solenoid has 450 turns per meter and a radius of 1.17 cm. The current in the solenoid is increasing at a uniform ra

sergey [27]

Answer:

$\frac{di}{dt} = 7.31 \ A/s$

Explanation:

From the question we are told that

The number of turns is $N = 450 \ turns$

The radius is $r = 1.17 \ cm = 0.0117 \ m$

The position from the center consider is x = 3.45 cm = 0.0345 m

The induced emf is $e = 8.20 *10^{-6} \ V/m$

Generally according to Gauss law

$\int\limits { e } \, dl = \mu_o * N * \frac{di}{dt } * A$

=> $e * 2\pi x = \mu_o * N * \frac{d i }{dt } * A$

Where A is the cross-sectional area of the solenoid which is mathematically represented as

$A = \pi r ^2$

=> $e * 2\pi x = \mu_o * N * \frac{d i }{dt } * \pi r^2$

=> $\frac{di}{dt} = \frac{2e * x }{\mu_o * N * r^2}$ ggl;

Here $\mu_o$ is the permeability of free space with value

$\mu_o = 4\pi * 10^{-7} \ N/A^2$

=> $\frac{di}{dt} = \frac{2 * 8.20*10^{-6} * 0.0345 }{ 4\pi * 10^{-7} * 450 * (0.0117)^2}$

=> $\frac{di}{dt} = 7.31 \ A/s$

6 0

4 years ago

At an amusement park, the wheelie carries passengers in a circular path of radius r = 11.2 m. If the angular speed of the wheeli

Dafna1 [17]

Answer:

(a) Tangential velocity will be 38.648 m/sec

(b) Acceleration will be $133.617m/sec^2$

Explanation:

We have given radius r = 11.2 m

Angular speed $\omega =0.550rev/sec=0.550\times 2\pi =3.454rad/sec$

(a) We have to find the tangential velocity

We know that tangential velocity is given by

$v_t=\omega r=3.454\times 11.2=38.684m/sec$

(b) We know that acceleration is given by

$a=\frac{v^2}{r}=\frac{38.684^2}{11.2}=133.617m/sec^2$

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3 years ago

A large reduction in the current account deficit will place ____ pressure on the home currency value, other things being equal.

shepuryov [24]

Answer:

Upward.

Explanation:

A large reduction in the current account deficit will place Upward pressure on the home currency value, other things being equal.

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4 years ago

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Fusion,melting,vaporization,submlimination are examples of endothermic changes

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3 years ago

Read 2 more answers