7. An airplane travels 4988.966 Km in 57 minutes. Calculate the average speed in
km/sec.

Answer:

Projectile motion is the motion of an object thrown or projected into the air, subject to only the acceleration of gravity. The object is called a projectile, and its path is called its trajectory. The motion of falling objects, as covered in Problem-Solving Basics for One-Dimensional Kinematics, is a simple one-dimensional type of projectile motion in which there is no horizontal movement. In this section, we consider two-dimensional projectile motion, such as that of a football or other object for which air resistance is negligible.

Explanation:

B the dropped ball

Answer:

For starters the membrane voltage is the same in nerve cells as in muscle cells.

As for skin and muscle cells, both cells arise from the same type of embryonic layer, the ectoderm and both which produces energy, though skin cells eventually lose their organelles.

Answer: The connection between the two is that potential energy transforms into kinetic energy.

Explanation:

Answer:

True

Explanation:

There are two major pure substances in Chemistry namely: elements and compounds. Elements are substances made up of only one type of atom which cannot be broken down. For example, H2 symbolizing hydrogen gas is an element.

On the other hand, atoms of different elements can combine together and be held by chemical bonds to form substances called COMPOUNDS. Hence, a compound is pure substance made of more than one type of element bound together in fixed ratios. For example, Al2O3 is a compound comprising of elements Al (aluminum) and O (oxygen) in a fixed ratio of 2:3.

Answer:

NEGATIVE

Explanation:

Answer:

The reason is because a heat pump uses external power to accomplish the work of transferring energy from the heat source to the heat sink. Heat pumps are significantly more energy efficient than simple electrical resistance heaters. The efficiency begins to decrease as the temperature difference between the heat source and sink increases.

Answer: 20.4 m

Explanation: [tex]\frac{9.8^{2} }{Velocity} = Max Height[/tex]

The answers to this test are:

1.  What is the maximum speed when the conditions are mass = 450 kg, initial height = 30 m, and the roller coaster car is initially at rest?  

24.2 m/s

2. A computational model predicts the maximum height that a roller coaster car can reach when the lowest height of its journey is at ground level, where it has a speed of 20 m/s. Given these conditions, what is the maximum height?

20.4 m

3. A computational model predicts the speed of a roller coaster car at different heights given its speed at the lowest height of its journey, which is at ground level. The speed at the lowest point is 30 m/s. What is the prediction for its speed when it is at a height of 20 m?

22.5 m/s

4. A computational model predicts the maximum potential energy a roller coaster car can have given its mass and its speed at the lowest point of its journey. Its mass is 350 kg, and it speed at a height of 0 m is 25 m/s. What is the prediction for its maximum potential energy?

109,375 J

5. What is the benefit of using simple computational models in a spreadsheet application, like the one used in this course, to predict mechanical energy and related values?

It is easy to calculate new scenarios.

Answer:

Both are physical changes

Explanation:

The dissolution of 1 gram of copper sulphate powder in a small amount of hot water in the presence of dilute H2SO4 is a physical change because no new substance was really formed in the process. This implies that step 1 is a physical change.

In step II, the hot liquid is allowed to cool leaving behind a beautiful blue coloured solution. This also is a physical change.

Hence both step I and step II are physical changes.

Answer:

Dy = - 0.0789 [m]

Explanation:

The vertical component of the vector can be determined with the sine of the angle.

Dy = 0.250*sin(18.4)

Dy = 0.0789 [m]

As the y-component is pointing downwards the component is negative.

Dy = - 0.0789 [m]

Answer:

15m

Explanation:

The figure shows about the rotating earth.

To find the correct option among all the options, we need to know about the rotation state of earth.

Motion of earth about its own axis is known about its rotation motion.

In revolving and orbital motion, an object moves around an axis out side of that bulk of object in a certain orbit, while in rotational motion, the object moves around its own axis.

Rotation motion is represented by drawing an axis in the bulk of object and to indicate the rotation a circular arrow is drawn.

Thus, we can conclude that the figure shows about the rotating earth.

Learn more about rotation motion here:

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Answer:

hjkjjjrjebdbnnd heudhdb

Answer:

Twice the work needed to lift the 20cm object

Explanation:

Work done is derived using the expression below;

  Work done  = Force x distance

For this problem, we are lifting through a vertical height;

  Work done  = mg x h

 mg is the weight of the body;

Since both bodies have the same weigh;

   W1 is the workdone to lift 20cm

   W2 is the workdone to lift 40cm

   For the first lift;

         W1  = (mg) x 20cm

         (mg)  = [tex]\frac{W1}{20}[/tex]  

   For the second lift;

          W2  = (mg)  x 40cm

   Since they both have the same weight

          (mg)  = [tex]\frac{W2}{40}[/tex]  

Equating the two weights;

      [tex]\frac{W1}{20}[/tex]   =  [tex]\frac{W2}{40}[/tex]  

     20W2  = 40W1

          W2  = [tex]\frac{40W1}{20}[/tex]   = 2W1

Answer:

Explanation:

How would this number be expressed in scientific notation? 1.898^27 kg. ...

Answer:

4km

Explanation:

Distance=speed x time

Knowing this we know the time and speed

so it is 8 x .5= D

And 8 x .5 =4

If you have any questions let me know

Answer:

3600J

Explanation:

The amount of energy transferred in two minutes by the given heater is 3600J of energy.

             60 seconds  =  1 minutes

            In two minutes, the number of seconds = 2 x 60  = 120seconds

So, on the table, at 120 seconds, 3600J of energy would have been transferred.

Answer:

c

Explanation:

Answer:

m per second is the answaegnzxn

The momentum of the bowling ball at the point where it reaches a speed of 3.6 m/s is 22.3 Kg.m/s (Option C)

Momentum is defined as the product of mass and velocity. It is represented mathematically as:

Momentum = mass × velocity

Now, we can obtain the momentum of the bowling ball at the point where it reaches a speed of 3.6 m/s. Details below:

Momentum = mass × velocity

Momentum =  6.2 × 3.6

Momentum = 22.3 Kg.m/s

Thus, the momentum at the point is 22.3 Kg.m/s (Option C)

Learn more about momentum:

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Answer:

0.5s

Explanation:

Given parameters:

Mass of the complex  = 4 x 10kg

Distance moved  = 6.5m

Work done  = 2.6 x 10¹J

Power  = 5.7 x 10W

Unknown:

Time taken  = ?

Solution:

Power is the rate at which work is done.

  Power  = [tex]\frac{work done}{time}[/tex]

  work done  = power x time

        time  = [tex]\frac{work done }{power}[/tex]

  Insert the parameters;

       time  = [tex]\frac{260}{570}[/tex]   = 0.5s

Answer:

I believe the answer is B.

Explanation:

Newton's First Law of Gravity states, "The greater the weight (or mass) of an object, the more inertia it has. Heavy objects are harder to move than light ones because they have more inertia. "

The answer is D.

All objects travel at the same speed due to gravity.

I hope I helped! Sorry if my inference was incorrect.

Answer:

When work is being done, the practie of labor is being performed. When work isn't being completed, this is a sign of procrastination.

Explanation:

In the answer.

Answer:

D- energy is being transferred

Explanation:

Answer:

6.25 m/s

Explanation:

Given parameters

Initial mark = 65

Final mark  = 15

time taken = 8s

Unknown:

Velocity of the runner  = ?

Solution:

Velocity is the displacement divided by time;

        Velocity  = [tex]\frac{displacement}{time}[/tex]  

Displacement  = Initial mark - final mark  = 65 - 15 = 50m

Now, insert the parameters and solve;

       Velocity  = [tex]\frac{50}{8}[/tex]   = 6.25m/s

Answer:

15.7m/s

Explanation:

To solve this problem, we use the right motion equation.

 Here, we have been given the height through which the ball drops;

 Height of drop = 14.5m - 1.9m  = 12.6m

The right motion equation is;

      V²  = U² + 2gh

V is the final velocity

U is the initial velocity  = 0

g is the acceleration due to gravity  = 9.8m/s²

h is the height

  Now insert the parameters and solve;

       V² = 0² + 2 x 9.8 x 12.6

      V²  = 246.96

       V = √246.96  = 15.7m/s

Answer:

This is easy. You subtract the final temperature from the starting temperature to find the difference. So if something starts at 50 degrees Celsius and finishes at 75 degrees C, then the change in temperature is 75 degrees C – 50 degrees C = 25 degrees C. For decreases in temperature, the result is negative.

Answer:

?? what

Explanation:

Answer:

True

Explanation:

It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion. Any change in motion involves an acceleration, and then Newton's Second Law applies.

- Hyperphysics

Answer:

true

Explanation:

because that's the answer