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3 years ago

Is a frame of reference usually moving

1 answer:

5 0

A reference frame can be moving. To make sure that newtons laws still apply, the reference frame must not be accelerating.

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Give an example of an issue that is currently being debated in the public sphere? Why is this issue a hot topic?

aliya0001 [1]

Palestine vs. Israel Palestine is demanding freedom from Israel when they already have their freedom

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2 years ago

A man claims that he can hold onto a 15.0-kg child in a head-on collision as long as he has his seat belt on. Consider this man

suter [353]

Answer:

F= 5195.625 N

Explanation:

To obtain the force needed to hold the child, we need to know the aceleration in which the car is breaking.

Aceleration is equal to velocity divided by the time of breaking

In international system, velocity [m/s] is

v= (62 mi/h)*(1609 m/mi)*(1 h/3600 s)

v= 27.71 m/s

Now, we part the velocity by the time that is 0.08 seconds

a= v/t= (27.71 m/s)/(0.08 s)

a= 346.375 m/ $s^{2}$

The force in agreement with the Newton's second law is

F=m*a = 15 Kg*346.375 m/ $s^{2}$

F= 5195.625 N

(Note: 1 N = 1 Kg*m/ $s^{2}$ )

3 0

3 years ago

It takes 4.186 J of energy to raise the temperature of lg of water by 1°C. How fast would a 2 g

mezya [45]

Answer:

1. D - 3.6 x 10^4 J

2. D - 0.04

3. A - 30.3 m/s

4. C - 3.67 x 10^8 J

5. A - 38.6 m

6. C - 7.07 m/s

7. B - 4.21 g

8. B - -6.56 J

9. A - 65 m/s

10. B - 116 Days

5 0

3 years ago

one arm of a u shaped tube contains water and the other alcohol. if the two fluids meet exactly at the bottom of the U and the a

Tema [17]

Complete Question

One arm of a U-shaped tube (open at both ends) contains water, and the other alcohol.

If the two fluids meet at exactly the bottom of the U, and the alcohol is at a height of 18 cm, at what height will the water be?Assume the density of alcohol is $\rho_a = 790\ kg/m^3$

Answer:

The height of water is $h_w = 0.142 \ m$

Explanation:

From the question we are told that

The height of the alcohol is $h_a =18 \ cm = 0.18 \ m$

The density of the alcohol is $\rho_a = 790\ kg/m^3$

Generally the pressure on both arm of the tube are equal given that they are both open

i,e $P_a = P_w$

Where $P_a$ is pressure of alcohol and $P_w$ is pressure of water

So the pressure on the arm of the tube containing the alcohol is mathematically evaluated as

$P_a = g * h * \rho$

substituting values

$P_a =9.8 * 0.18 * 790$

$P_a = 1394 \ Pa$

Generally the pressure on the arm of the tube containing the water is mathematically evaluated as

$P_w = g * h_w * \rho_w$

where $\rho_w$ is the density of water which has a value $\rho _w = 1000 \ kg/m^3$

$1394 = 9.8 * h_w * 1000$

=> $h_w = \frac{1394}{9800}$

=> $h_w = 0.142 \ m$

3 0

3 years ago

What is the difference between mechanical advantage and distance advantage?

eimsori [14]

A machine's distance mechanical advantage shows the effectiveness of the machine in moving an object a greater distance than the input distance. The equation for the distance mechanical advantage is the output distance divided by the input distance. Note: Most science books only consider force mechanical advantage. I HOPE THIS HELPS!

3 0

2 years ago