Directions: Complete the concept map using the terms listed below.

A 1,400 kilogram car travels in a straight line at 10.0 m/sec. what is the momentum

Taya2010 [7]

Momentum = mass * velocity
= 1400 * 10
= 14000 kg m per sec

8 0

4 years ago

Which of the following statements about stress management is TRUE?

ivolga24 [154]

Answer:

A

Explanation:

Basically all the other answer are opposites like Exercise is an effective way to relieve stress and lots of Stress does have Negative effects on people

7 0

3 years ago

Read 2 more answers

ncreasing the frequency of rotation of the coils in an electrical generator increases the output emf.urn coil with a 0.250 m2 ar

Readme [11.4K]

The question is incomplete. The complete question is:

A 500-turn coil with a 0.250 m2 area is spun in the Earth’s 5.00 × 10−5 T field, producing a 12.0 kV maximum emf. (a) At what angular velocity must the coil be spun? (b) What is unreasonable about this result? (c) Which assumption or premise is responsible?

Answer:

ω=1.92 × 106 rad/s

Explanation:

Emfo= 12.0×10^3 V

N= 500 turns

A= 0.250 m^2

B= 5.00×10^-5

ω=??????

From

Emfo= NABω

ω= Emfo/NAB

ω= 12.0×10^3/500×0.250×5.00×10^-5

ω=1.92 × 106 rad/s

b) This angular velocity is unreasonably high, it is very much higher than a value that can be obtained for any mechanical system.

c) The unreasonable assumption or premise that a peak voltage as high as 12.0kV may be obtained.

5 0

3 years ago

A brine solution of salt flows at a constant rate of 7 L/min into a large tank that initially held 100 L of brine solution in w

larisa86 [58]

Answer:

Explanation:

Let x(t) represent the amount of salt (in kg) at any time, t (in minutes).

Step 1

Write down the input rate and output rate in terms of x (showing how you get units). What is the differential equation for x (simplified)?

Input rate: (7L/min) x (0.02kg/L) = 0.14 = 7/50

Output rate: (7L/min) (x/100 kg/L) = 7x / 100

Differential Equation: δx/δt =

=> 7/50 - 7x/100

step 2

Find the general solution for your differential equation

DE is linear with μ(t) = e^(7t/100), so solving we have

x = x(t) = e^(- 7t/100) ∫7/50 e^(- 7t/100) dt

= 50 + C e^(- 7t/100)

The initial condition mass of salt given is 0.1kg, using this we find the constant of integration

so, when t = 0, x = 0.1, therefore

0.1 = 50 + C

C = - 49.9

Hence x(t) = 50 - 49.9e^(- 7t/100)

When will the concentration of salt in the tank reach 0.01 kg/L?

concentration = 0.01kg/L

This is the same as

x/100 = 0.01

=> x = 1

Substituting x = 1 into the solution yields

1 = 50 - 49.9e^(- 7t/100)

t = 9.2486

Therefore the concentration of salt in the tank reach 0.01kg /L after 9.2486 minutes.

6 0

4 years ago

Which objects will likely have the greatest gravitational force between them?

Mariulka [41]

Answer:

d. Two soccer balls that are touching each other

Explanation:

Let $m_1$ be the mass of a tennis ball, $m_2$ is the mass of a soccer ball.

As the mass of a soccer ball is more than the mass of a tennis ball, so

$m_2 > m_1$

Let $d_1$ be the distance between the centers of both the balls near each other and $d_2$ be the distance between the centers of both the balls touching each other.

So, $d_2 > d_1$

The gravitational force, F, between the two objects having masses M and m and separated by distance d is

$F=\frac{GMm}{d^2}$

Where G is the universal gravitational constant.

As, the gravitational force is directly proportional to the product of both the masses and inversely proportional to the square of the distance between them, so selecting the larger mass ( $m_2$ , soccer ball) separated by a lesser distance ( $d_2$ , touching) to get more gravitational force.

Therefore, there will be a larger gravitational force between them when two soccer balls touching each other.

Hence, option (d) is correct.

3 0

3 years ago