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3 years ago

What’s the answer????

Physics

1 answer:

Alexus [3.1K]3 years ago

7 0

Answer:

left side

Explanation:

It's smaller in length but still has a pretty close slope to the right side.

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Until a train is a safe distance from the station, it must travel at 5 m/s. Once the train is on open track, it can speec

nadezda [96]

Answer:

The acceleration of the train is 5 m/s².

Explanation:

Given:

let the initial velocity of a train = 5 m/s and

final velocity of a train = 45 m/s

time taken = 8 s

To find:

acceleration: ?

Solution:

We define acceleration as change in velocity per unit time that is the difference between the final velocity and initial velocity divided by time.

$Acceleration = \frac{\textrm{final velocity} - \textrm{initial velocity}}{time} \\$

On substituting the above values we get the required acceleration

$Acceleration = \frac{45 - 5}{8}\\ =\frac{40}{8}\\ =5\ m/s^{2}$

Therefore,the acceleration of the train is 5 m/s².

4 0

3 years ago

Consider a large tank holding 1000 L of pure water into which a brine solution of salt begins to owat a constant rate of 6L/min.

lbvjy [14]

Answer:

T = 693.147 minutes

Explanation:

The tank is being continuously stirred. So let the salt concentration of the tank at some time t be x in units of kg/L.

Therefore, the total salt in the tank at time t = 1000x kg

Brine water flows into the tank at a rate of 6 L/min which has a concentration of 0.1 kg/L

Hence, the amount of salt that is added to the tank per minute = $(6\times0.1)kg/min=0.6kg/min$

Also, there is a continuous outflow from the tank at a rate of 6 L/min.

Hence, amount of salt subtracted from the tank per minute = 6x kg/min

Now, the rate of change of salt concentration in the tank = $\frac{dx}{dt}$

So, the rate of change of salt in the tank can be given by the following equation,

$1000\frac{dx}{dt} =0.6-6x$

or, $\int\limits^{0.05}_0 {\frac{1000}{0.6-6x} } \, dx =\int\limits^T_0 {} \, dt$

or, T = 693.147 min (time taken for the tank to reach a salt concentration

of 0.05 kg/L)

3 0

3 years ago

PLEASE HURRY AND HELP ME

laila [671]

Answer:

I believe the answer would be C. point z

5 0

3 years ago

What color is a carrot?

Mashutka [201]

Answer:

reddish-orrange

Explanation:

please mark me as brainliest

7 0

3 years ago

The spectral distribution of the radiation emitted by a diffuse surface may be approximated as follows. HW 2 Q2 (a) What is the

Ronch [10]

Answer:

a) 2000 W/m² ; b) 636.94 W/m².sr ; c) 0.5

Explanation:

The formula for calculation of total emissive power is:

Total emissive power = E = $\int\limits^\alpha_0$ E'λdλ

= $\int\limits^a_0$ (0)dλ + $\int\limits^b_a$ (100)dλ + $\int\limits^c_b$ (200)dλ + $\int\limits^d_c$ (100)dλ $\int\limits^e_d$ (0)dλ

where a = 5; b = 10; c = 15; d = 20; e = 25

= 0 +100(10-5) + 200(15-10) +100(20-15) + 0

= 2000 W/m²

The formula for total intensity of radiation is:

I $_{e}$ = E/π = 200/3.14 = 636.94 W/m².sr

c)

Fo submissive power leaving the surface in range π/4 ≤θ≤π/2

[E(π/4 ≤θ≤π/2)]/E = $\int\limits^f_0$ $\int\limits^g_0$ $\int\limits^i_h$ Icosθsinθ dθdΦdλ

where f = infinity, g=2π, h=π/4, i=π/2

By simplifying, we get

= (-1/2)[cos(2π/2)-cos(2π/2)]

= -0.5(-1-0)

=0.5

8 0

3 years ago