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2 years ago

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The population in the United States in 2015 was 321 million people. It is projected to increase to 438 million people by the yea

r 2050.
If projections are true, the US population will increase _______% from 2015 to 2050.

2 answers:

Elza [17]2 years ago

6 0

Answer: So, en 2015 the population is 321 mill, and the prediction is it will increase to 438 mill in 2050.

If the projection is true, we can see that the relation between these numbers is 438/321 = 1.364

this means that the population in 2050 is 1.364 times the population in 2015. In percentage, the population in 2050 is 136.4% of the population in 2015, so the increment in population is 36.4%.

velikii [3]2 years ago

4 0

It increases by 35% ......

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The gravitational potential energy is calculated by multiplying the mass of the object to the height and the gravitational acceleration which is 9.8 m/s^2. We do as follows:

GPE = mgh
GPE = 4942
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On a horizontal, linear track lies a cart that has a fan attached to it. The mass of the cart plus fan is 364 g. The cart is pos

mamaluj [8]

Answer:

6.62s

Explanation:

Metric unit conversion:

364 g = 0.364 kg

789 g = 0.789 kg

Starting from rest, the cart takes 4.49 s to travel a distance of 1.43 m. We can use the following equation of motion to calculate the constant acceleration

$s = a_1t_1^2/2$

$a_1 = \frac{2s}{t_1^2} = \frac{2*1.43}{4.49^2} = 0.142 m/s^2$

Using Newton's 2nd law, we can calculate the force generated by the fan to push the 0.364 kg cart forward

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Now that more mass is added, the new acceleration of the 0.789 kg cart is

$a_2 = F/m_2 = 0.052 / 0.789 = 0.065 m/s^2$

We can reuse the same equation of motion to calculate the time it takes to travel 1.43 m from rest

$s = a_2t_2^2/2$

$t_2^2 = 2s/a_2 = 2*1.43/0.065 = 43.7$

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Solenoid 2 has twice the diameter, twice the length, and twice as many turns as solenoid 1. How does the field B2 at the center

klemol [59]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The correct option is option 3

Explanation:

From the question we are told that

The diameter of solenoid 1 is $d_1$

The length of solenoid 1 is $L_1$

The number of turns of solenoid is $N_1$

The diameter of solenoid 2 is $d_2 = 2d_1$

The length of solenoid 2 is $L_2 = 2L_1$

The number of turns of solenoid 2 is $N_2 = 2 N_1$

Generally the magnetic in a solenoid is mathematically represented as

$B = \frac{\mu_o * N * I }{L}$

From this equation we see that

$B \ \alpha \ \frac{N}{L}$

$B = C \frac{N}{L}$

Here C stands for constant

=> $C = \frac{B * \frac{L}{N}$

=> $\frac{B_1 * \frac{L_1}{N_1} = \frac{B_2 * \frac{L_2}{N_2}$

=> $\frac{B_1}{B_2 } = \frac{N_1 L _2}{ N_2L_1}$

=> $\frac{B_1}{B_2 } = \frac{N_1 * (2 L_1)}{ (2 N_2)L_1}$

=> $\frac{B_1}{B_2 } = 1$

=> $B_2 = B_1$

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Answer:

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Explanation:

Because, the longer skid occurs with greater inertia. Objects with more mass produces more inertia.

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2 years ago