Question 7 of 20
Which sample of water has the most thermal energy?
A. A 1.5 kg sample at 10°C
O B. A 0.5 kg sample at 1°C
O C. A 1 kg sample at 10°C
O D. A 1 kg sample at 4°C

Answer:

increases

Explanation:

Answer:

increases

Explanation:

Answer: C

Explanation:

Gravity is acting equally on both objects causing the same vertical velocity because they are the same objects. The object launched horizontally off a cliff has a longer range because of the greater initial horizontal velocity

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The answer to the question related to the time for two balls to reach the ground is option C, the two balls will reach the ground at the same time because the horizontal and vertical planes of motion are independent of each other, and they are also released from the same height.  

When a ball is dropped, knowing the height we could find the time with the following equation:

[tex] y_{f} = y_{i} + v_{i_{y}}t - \frac{1}{2}gt^{2} [/tex] (1)

Where:

[tex] y_{f} [/tex]: is the final height

[tex] y_{i} [/tex]: is the initial height

[tex]v_{i_{y}}[/tex]: is the initial speed of the ball in the vertical direction = 0 (it is dropped)

g: is the acceleration due to gravity

When the ball is launched horizontally from the same height, we could find the time with equation (1) since the acceleration in the horizontal direction is zero and the initial velocity in the vertical direction is also zero.

The horizontal motion is related to the equation:

[tex] x = v_{i_{x}}*t [/tex]   (2)

We can notice in both cases that the ball is accelerated only by gravity.

Let's evaluate each statement

A) This statement is incorrect because the path is the same for both cases. The ball is dropped and launched from the same height.

B) This statement is also incorrect. The velocity of the dropped ball is the same as the velocity of the launched ball because the ball is accelerated only by gravity.

C) This statement is correct. We can see that we would get the same time in equation (1) since [tex]v_{i_{y}}[/tex], [tex]y_{f}[/tex], and [tex]y_{i}[/tex] is the same for the dropped ball and the launched ball.  

D) This statement is incorrect. The nature of motion is related to a freefall motion in both cases.  

Therefore, the answer is option C.

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Answer: D. 332n

Explanation: I took the quiz and that was the correct answer

Answer:

D

Explanation:

Answer:

7 42 x 10^1

Explanation:

Because 10 x 1 =10

Answer:

m = 20,000 kg

Explanation:

Force, [tex]F=2.5\times 10^4\ N[/tex]

Acceleration of the shark, [tex]a=1.25\ m/s^2[/tex]

It is required to find the mass of the shark. Let m is the mass. Using second law of motion to find it as follows :

F = ma

Putting the value of F and a to find m

[tex]m=\dfrac{F}{a}\\\\m=\dfrac{2.5\times 10^4}{1.25}\\\\m=20,000\ kg[/tex]

So, the shark's mass is 20,000 kg.

Answer:

i think its student b (d)

Explanation:

it might be student b cuz every action creates an equal and opposite reaction

Student B states that when she sits on the chair, the chair is actually exerting a force back on her in reaction to her force exerted upon the chair because of newton's third law. Hence, option D is correct.

The third law of Newton asserts that when bodies interact, they exert forces that are equal in size and directed in the opposite direction. Another name for the third law is the law of reaction and action. This law is crucial for understanding issues with static balance, where all pressures are in balance, but it also remains true for bodies moving at a constant or accelerated speed.

It doesn't only use bookkeeping methods; the forces it represents are actual forces. For illustration, a book laying on a table exerts downward pressure equal to the weight of the book on the table. The table produces an equal and opposite force on the book in agreement with the third law.

Therefore, student B is correct that because of Newton's third law there is an equal and opposite action and counteracts the student's so that neither move.

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Answer:

B

Explanation:

You need a specific force to change the momentum of something.

Hope this helps!

Answer:

Acceleration, [tex]a=0.5\ m/s^2[/tex]

Explanation:

The question says " A body travels with a speed of 10 m / s then increases to 15 m / s, this increase was during 0 s to 10 s, what is the acceleration of the body? ".

Initial speed, u = 10 m/s

Final speed, v = 15 m/s

Time interval, t = 10 s

We need to find the acceleration of the body. It is equal to the rate of change of velocity. It can be given by the formula as follows :

[tex]a=\dfrac{15-10}{10}\\\\a=0.5\ m/s^2[/tex]

So, the acceleration of the body is [tex]0.5\ m/s^2[/tex].

Answer:

d=3.4m

Explanation:

From principle of equilibrium,

TOTAL C.WISE MOMENTS = TOTAL A.C.WISE

10N×d = 2N ×2m + 6N×5m

10Nd =4Nm+ 30Nm

10Nd=34Nm

10N 10N

d=3.4m

The system is in equilibrium, calculate the missing distance d=3.4 m.

Displacement is defined as the change in position of an object. It is a vector quantity and has a direction and magnitude.

From principle of equilibrium,

TOTAL C.WISE MOMENTS = TOTAL A.C.WISE

10 N×d = 2 N ×2 m + 6 N×5 m

10 Nd = 4 N m+ 30 N m

10 Nd = 34 N m

d = 3.4 m

The system is in equilibrium, calculate the missing distance d=3.4 m.

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Answer:

A vegetarian diet that includes no meet is the best description of a balanced diet

Answer:

I should be B

Explanation:

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A fertilized cell divides many times to form an embryo.  - true

Human reproduction requires two reproductive cells from each parent.  - true

Growth is caused by cells in your body dividing and making new cells.  - false

A cell nucleus contains DNA, which is a chemical code for all inherited traits.  - true

Answer:

true false true true

Explanation:

i took the quiz on keystone school and i didnt pass but i saw the end awnser

Explanation:

Compounds are substances composed of two or more kind of atoms or elements joined together in a definite grouping. The properties of compounds are distinct from those of the individual elements that are combined in its make up.

There are several millions of compounds that are known. Compounds are derived from elements. They are usually represented by chemical formulae.

Answer:

Newton's second law of motion states that the acceleration of a system is directly proportional to and in the same direction as the net external force acting on the system, and inversely proportional to its mass. If the only force acting on an object is due to gravity, the object is in free fall.

Explanation:

Hope this helps :)

Answer:

a = 5 [m/s²]

Explanation:

To solve this equation we must use the following equation of kinematics.

[tex]v_{f} =v_{o} +a*t[/tex]

where:

Vf = final velocity = 25 [m/s]

Vo = initial velocity = 5 [m/s]

a = acceleration [m/s²]

t = time = 4 [s]

Note: The positive sign for the acceleration in the above equation means that the car is increasing its velocity.

25 = 5 +a*(4)

25 - 5 = 4*a

20 = 4*a

a = 5 [m/s²]

Answer:

Explanation:

The speed of an object can be found by using the formula

[tex]s = \frac{d}{t} \\ [/tex]

d is the distance

t is the time taken

From the question we have

[tex]s = \frac{150}{50} = \frac{15}{5} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

110

Explanation:

i dont know

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Answer:

Current, I = 8 Amps

Explanation:

Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.

Mathematically, Ohm's law is given by the formula;

[tex] V = IR[/tex]

Where;

V represents voltage measured in voltage.

I represents current measured in amperes.

R represents resistance measured in ohms.

Given the following data;

Resistance, R = 30 ohms

Voltage, V = 240V

To find the current;

[tex] I = \frac {V}{R} [/tex]

[tex] I = \frac {240}{30} [/tex]

Current, I = 8 Amps

Therefore, the current of the dryer is 8 Amperes.

Answer: 1700

Explanation:

Answer:

ahh yes you are so smart and I hope you get a good job when you are older

Explanation:

A machine is a device that does work. Most machines consist of a number of elements, such as gears and ball bearings, that work together in a complex way. Nonetheless, no matter how complex they are, all machines are based in some way on six types of simple machines. These six types of machines are the lever, the wheel and axle, the pulley, the inclined plane, the wedge, and the screw.

Answer:

(a) Cyclist A travels faster.

(b) The time taken by cyclists A and B is 10 minutes and 8.58 minutes respectively.

Explanation:

Given that the speed of cyclist A= 24 km/h

As 1 km = 1000 m and 1 hour= 3600 seconds.

So, [tex]24 \frac {km}{h}=24\times \frac{1000 m}{3600 s}=\frac{20}{3}\frac {m}{s}=6.67 m/s[/tex]

and the speed of cyclist B = 6.8 m/s.

The length of the road = 4 km=4000 m.

(a) Speed of cyclist A is 6.67 m/s which is more than the 6.8 m/s.

Hence, cyclist A travels faster.

(b) If d be the distance to be traveled and V be the speed, than the time, t, required is,

[tex]t=\frac{d}{V}\cdots(i)[/tex]

For cyclist A:

As A is located at the beginning of the road, he has to cover full length of the road.

So, the distance to be covered by cyclist A =4 km.

Hence, from equation (i), the time taken by cyclist A is

[tex]t=\frac{4}{24}=\frac{1}{6}[/tex] hour

[tex]=\frac{1}{6}\times {60}=10[/tex] minutes. [ as 1 hour = 60 minumes]

So, time taken by cyclist A is 10 minutes.

For cyclist B:

As B is located 500 meters later from the beginning of the road, he has to cover the remaining length of the road.

So, the distance to be covered by cyclist B =4000 m-500 m= 3500 m.

Hence, from equation (i), the time taken by cyclist B is

[tex]t=\frac{3500}{6.8}=514.71[/tex] seconds

As 60 seconds= 1 minute.

So, t= 514.71/60 minutes = 8.58 minutes.

[tex]=\frac{1}{6}\times {60}=10[/tex] minutes. [ as 1 hour = 60 minumes]

So, the time taken by cyclist B is 8.58 minutes.

Answer:

Acceleration, a = 750m/s²

Explanation:

Given the following data;

Radius, r = 0.31m

Velocity, v = 15m/s

To find the centripetal acceleration;

[tex] Acceleration, a = \frac {v^{2}}{r}[/tex]

Substituting into the equation, we have;

[tex] Acceleration, a = \frac {15^{2}}{0.31}[/tex]

[tex] Acceleration, a = \frac {225}{0.31}[/tex]

Acceleration, a = 750m/s²

Therefore, the centripetal acceleration of the bike wheel is 750m/s².