All categories

4 years ago

3.

Physics

2 answers:

Alborosie4 years ago

4 0

Answer:

Explanation:

Acceleration is defined as a change in velocity over time. This means that as long as the forces are not zero, the velocity should be changing. The can be negative (as this is negative acceleration also known as deceleration) or positive (known as acceleration). It doesn't matter if they are decimals or fractions.

Nookie1986 [14]4 years ago

4 0

In order for acceleration of an object to occur, the sum of the forces must be anything but zero.

Answer: Option C

<u>Explanation: </u>

Based on Newton second laws of motion, the acceleration due to gravity of any object is directly proportional to the net force acting on the object and inversely proportional to the mass of the object. So, the sum of all the forces acting on the object will decide the acceleration attained by the object.

If the total forces are zero then the acceleration of the object will be zero. In case of deceleration, the net force would be having negative sign and thus increase in net force will lead to increase in acceleration. Hence, for the occurrence of acceleration, the total forces sum would be anything but zero.

You might be interested in

What is the half-life for the radioactive decay of particle that

pogonyaev

Answer:

ytyug

Explanation:

4 0

3 years ago

Heat energy moves:_______.

steposvetlana [31]

c) only from warmer areas to colder areas.

The second principle of thermodynamics states that heat can only flow from a hotter body to a cooler one. Specifically, Clausius statement says that is not possible for heat to move by itself from a lower temperature body to a higher temperature body.

3 0

3 years ago

Hooke's Law. The distance d when a spring is stretched by a hanging object varies directly as the weight w of the object. If th

nadezda [96]

Answer:

distance when the weight is 8 kg is 26.66 cm

Explanation:

given data

distance d2 = 10 cm

weight w2 = 3 kg

weight w1 = 8 kg

to find out

distance when the weight is 8 kg

solution

we consider here distance d1 when weight is 8 kg

so equation will be

d1/d2 = w1/w2

d/10 = 8/ 3

so d = 8/3 × 10

so d = 26.66

distance when the weight is 8 kg is 26.66 cm

7 0

3 years ago

A 35.4 kg girl is riding on the back of a 15.23 kg cart. the cart and the kid are both moving eastward at 4.25 m/s when she step

Grace [21]

Answer:

The final velocity of the cart is $v_c = 7.02 \ m/s$

Explanation:

From the question we are told that

The mass of the girl is $m_g = 35.4 \ kg$

The mass of the cart is $m_c = 15.23 \ kg$

The speed of the cart and kid(girl) is $v = 4.25 \ m/s$

The final velocity of the girl is $v_g = 3.06 \ m/s$

Let assume that velocity eastward is positive and velocity westward is negative (Note that if we assume vise versa it wouldn't affect the answer )

The total momentum of the system before she steps off the back of the cart

is mathematically evaluated as

$p__{T1}} = (m_g + m_c) * v$

substituting values

$p__{T1}} = (35.4 + 15.23) * 4.25$

$p__{T1}} =215.17 \ kg m /s$

The total momentum after she steps off the back of the cart is mathematically evaluated as

$p__{T2}} = (m_g * v_g ) +( m_c * v_c )$

Where $v_c$ is the final velocity of the cart

substituting values

$p__{T2}} = (35.4 * 3.06 ) +( 15.23 * v_c )$

$p__{T2}} = 108. 324 + 15.23 v_c$

Now according to the law of conservation of momentum

$p__{T1}} =p__{T2}}$

$215.17 \ kg m /s = 108. 324 + 15.23 v_c$

=> $v_c = 7.02 \ m/s$

Since the value is positive it implies that the cart moved eastward

7 0

3 years ago

24. A total of 165 J of work is done on a gaseous refrigerant as it undergoes compression. If the internal energy of the gas inc

Yuliya22 [10]

The total amount of energy transferred as heat is equal to 288 Joules.

<u>Given the following data:</u>

Internal energy = 123 Joules

Work done = 165 Joules

To calculate the total amount of energy transferred as heat, we would apply the first law of thermodynamics.

<h3>The first law of thermodynamics.</h3>

Mathematically, the first law of thermodynamics is given by the formula:

$\Delta E = Q - W$

<u>Where;</u>

$\Delta E$ is the change in internal energy.

Q is the quantity of heat transferred.

W is the work done.

Substituting the given parameters into the formula, we have;

$123 = Q - 165\\\\Q=123+165$

Q = 288 Joules.

Read more on internal energy here: brainly.com/question/25737117

4 0

3 years ago