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3 years ago

How heavy is an object that displaces 400N of water in a pool

1 answer:

3 0

We can only corelate the object's weight with the amount of water it was able to displaced.

If the water displaced was around 400N, then the amount of liter displaced is around 400 N (kg*m/s²) / 9.8 m/s² (earth's gravitational pull) which is equals to ~40.81 liters which should be the objects mass as the best assumption (1kg = 1L). As there is no direct link between the water displaced and actual object weight.

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2 toy cars move horizontally toward each other. When they are 40m apart one has an initial velocity of 6m/s and acceleration of

yanalaym [24]

Answer:

Part a)

$t = 2.62 s$

Part b)

the distance moved by car 1 is 29.5 m and distance traveled by car 2 is 10.5 m

Explanation:

Part a)

As we know that car 1 is moving with speed v = 6 m/s and acceleration 4 m/s/s

Then car 2 is moving at constant speed 4 m/s

now the relative speed of two cars is

$v_r = 6 + 4 = 10 m/s$

now the relative acceleration of two cars towards each other is given as

$a_r = 4 m/s^2$

now we will have

$d = v_i t + \frac{1}{2}at^2$

$40 = 10 t + \frac{1}{2}(4)t^2$

$t^2 + 5t - 20 = 0$

$t = 2.62 s$

Part b)

In the above time distance traveled by the car which is moving at constant speed is given as

$v = \frac{d}{t}$

$4 = \frac{d}{2.62}$

$d = 10.5 m$

so the distance moved by car 1 is 29.5 m and distance traveled by car 2 is 10.5 m

Part c)

4 0

3 years ago

If a 4 engine jet accelerates down a runway at 8.7 m/s^2, Suppose now that all 4 engins are operational on the jet from the prev

soldi70 [24.7K]

Answer:

$5.22m/s^2$

Explanation:

One of the first propulsion characteristics given in the example is that all engines are equal.

In this way if we have 4 engines running at the same time, it means that its capacity is 100%.

Under this premise, if 100% is found, the Jet is capable of reaching a speed of 8.7m / s ^ 2.

However, the question is, what would happen if 2.4 "Engines" now work.

To do this then we make a simple equivalence,

If 4 engines is the equivalent of 100%, when would it be 2.4 engines?

$X = \frac{2.4 * 100\%} { 4 }= 60\%$

In this way it would mean that the body could be driven to 60% of its total.

$Speed_{Decreased} = 8.7 * 60\% = 5.22 \frac{m}{s^2}$

3 0

2 years ago

How do scientists decide how they gather information

kogti [31]

The scientific method. When conducting research, scientists use the scientific method to collect measurable, empirical evidence in an experiment related to a hypothesis (often in the form of an if/then statement), the results aiming to support or contradict a theory.

3 0

3 years ago

A 5.00-g bullet is fired into a 900-g block of wood suspended as a ballistic pendulum. The combined mass swings up to a height o

Thepotemich [5.8K]

Answer:

The value is $KE_b =0.710 \ J$

Explanation:

From the question we are told that

The mass of the bullet is $m_b = 5.00 \ g = 0.005 \ kg$

The mass of the wood is $m_w = 900 \ g = 0.90\ kg$

The height attained by the combined mass is $h = 8.0 \ cm = 0.08 \ m$

Generally according to the law of energy conservation

$KE _b = PE_c$

Here $KE_b$ is the kinetic energy of the bullet before collision.

and $PE_c$ is the potential energy of the combined mass of bullet and wood at the height h which is mathematically represented as

$PE_m = [m_b + m_w] * g * h$

$KE_b =PE_c = [0.005 + 0.90] * 9.8 *0.08$

=> $KE_b =0.710 \ J$

3 0

3 years ago

5. A ball is sitting at rest on the floor. What will happen if a balanced force is applied to the ball? *

Leno4ka [110]

When the balanced force is applied on the ball It will roll away from the force.

Explanation:

A ball lies on the floor in rest. If the balanced force is applied to

the ball, the force will push away.

The forces would include gravity and the forces of air particles entering the ball from almost all directions.
And the ground is exercising the force and shifting away from the impact.

3 0

3 years ago