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4 years ago

Please Help!!!

Physics

2 answers:

marissa [1.9K]4 years ago

6 0

Answer: The correct answer is -

C) heterogenous mixture.

Heterogenous mixture can be described as a mixture that is non-uniform in its composition.

In other words, its constituent parts are present in different phase and unevenly/non uniformly distributed. By using different means of separation, the constituent parts of the mixture can be easily separated from one another.

In the given question, mixture that is investigated, contains particles, which are of different sizes, shapes, and colors. They are also unevenly distributed in the substance.

Thus, it represents heterogeneous mixture.

algol134 years ago

4 0

the answer should be C.

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A train traveling at 27.5 m/s accelerates to 42.4 m/s over 75.0 s. What is the displacement of the train in this time period

Sergio [31]

Answer:

2621.25 meters

Explanation:

First, write down what we are given.

Initial velocity = 27.5 m/s

Final velocity = 42.4 m/s

Time = 75 seconds

We need to look at the kinematic equations and determine which one will be best. In this case, we need an equation with distance. I am going to use $v_{f}^{2} = v_{i}^{2} +2ad$ , but you can also use the other equation, $x = v_{o}t+\frac{1}{2}at^{2}$

We need to find acceleration. To find it, we need to use the formula for acceleration: $a = \frac{v_{f}-v_{i}}{t}$ . Plugging in values, $a = \frac{42.4-27.5}{75} = .199\ m/s^{2}$

Next, plug in what we know into the kinematics equation and solve for distance. $42.4^{2} = 27.5^{2} + 2(.199)(d)\\d = 2621.25\ meters$

7 0

3 years ago

It takes five hours to drive from Fort Worth to Midland, which is a distance of 300 miles. What

Shkiper50 [21]

Answer:

Explanation:

(hint: speed = distance/time)

8 0

3 years ago

1.3 kg of water, at an initial temperature of 25oC, is heated at a rate of 100 W in a well-insulated container. How much time (i

Leviafan [203]

Answer:

68.25 minutes.

Explanation:

Power = Energy/time or

Power = Heat/time

P = Q/t....................... Equation 1

Q = Pt ........................ Equation 2

Where Q = quantity of heat, P = power, t = time.

Also,

Q = cm(t₂-t₁) ................. Equation 3

Where c = specific heat capacity of water, m = mass of water, t₁ = initial temperature of water, t₂ = final temperature of water.

substitute equation 2 into equation 3

Pt = cm(t₂-t₁) ............... Equation 4

make t the subject of the equation

t = cm(t₂-t₁)/P................ Equation 5

Given: P = 100 W, m = 1.3 kg, t₁ = 25 °C, t₂ = 100 °C.

Constant: 4200 J/kg.K

Substitute into equation 5

t = 1.3(4200)(100-25)/100

t = 409500/100

t = 4095 seconds

t = (4095/60) minutes = 68.25 minutes.

Hence the time it will take the water to reach boiling point = 68.25 minutes

6 0

3 years ago

How fast will a cart be moving if a force of 200 N is applied to a 50 kg cart for 10 sec?

jeka94

Acceleration = (force) / (mass)

If there is no friction . . .

Acceleration = (200N) / (50 kg) = 4m/s²

Change in speed = (acceleration) x (time) = (4 m/s²) x (10 sec) = 40 m/s

Final speed = (speed of the cart before the force began) + (40 m/s more)

(That's about 89 mph faster than the cart was moving before the force started.)

8 0

3 years ago

Read 2 more answers

A teacher does a demonstration in front of a class. For the demonstration, a motion sensor is placed at the end of a long, horiz

pogonyaev

Answer:

с. The net work done on the cart is equal to the change in kinetic energy of the cart.

Explanation:

In the context, a motion sensor detects the motion of the cart where a cart is used to move using a force sensor that is attached to the cart of certain mass. As the cart moves with a speed at a particular time, the computer records both the readings on the force sensor as well as the motion sensor. From these readings the is can be concluded that the work done on the cart is same as the change in the kinetic energy in the cart.

8 0

3 years ago