10. A car starts from rest and travels for 5.0 s with a constant acceleration of -1.5 m/s/s.
A. What is the final velocity of the car?
B. How far does the car travel in this time interval?

Answer:

momentum(M in Kgm/s)=mass(m in Kg) *velocity(v in m/s)

a) M=m*v. m=75kg,v=16 m/s

M =75*16

M=1200Kgm/s

b)M=135*16.2

M=2187Kgm/s

c)M = 0.8*6.5

M=5.2Kgm/s

Hope it is helpful?

The momentum of an object having mass

a) 75kg speed skater moving forward at 16m/s is 1200 kg.m/s

b) 135kg ostrich running north at 16.2m/s is 2187 kg.m/s

c) 0.8 kg kitten running to the left at 6.5 m/s is 5.2 kg.m/s

Momentum is defined as mass times velocity of body. it is denoted by p and its SI unit is Kg.m/s. It has both magnitude and direction. it is a vector quantity.

i.e. p = mv

a) Given,

mass m = 75Kg

velocity v = 16m/s

momentum p = 75× 16 = 1200 kg.m/s

b) Given,

mass m = 135Kg

velocity v = 16.2m/s

momentum p = 135×16.2 = 2187 kg.m/s

c) Given,

mass m = 0.8Kg

velocity v = 6.5m/s

momentum p = 0.8×6.5 =5.2 kg.m/s

Hence momentums of a), b) and c) are 1200 , 2187 and 5.2 kg.m/s respectively.

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Answer:

It applies to diverse phenomena

Explanation:

not sure if u need one, just ask if you do :D

Answer:

Being strictly geometric in its origin, the inverse square law applies to diverse phenomena. Point sources of gravitational force, electric field, light, sound, and radiation obey the inverse square law.

Explanation:

Answer:

Explanation:

The distance covered by an object given it's velocity and time taken can be found by using the formula

distance = velocity × time

From the question we have

distance = 40 × 3

We have the final answer as

Hope this helps you

When you set a heavy bag down on the ground, you are doing negative work on it.

Answer:

What about Newton's law of gravity.

Explanation:

The one with the apple falling on his head.

Answer:

K and N

Explanation:

Ionic character depends on the electronegativity difference between the bonding elements. The greatest the elctronegativity diffference the greatest the ionic character. The electronegativity difference between K and N is the greatest among the four options as N is one of the most electronegative elements.

Answer:

inner core ,outer core,and mantle

Answer: 4m/s

Explanation:

Speed = distance/time.

= 2/2 = 1 m/s

"Speed is defined as the distance travelled by a body per unit time." Its SI unit is m/s.

The distance covered by an object in unit time. In other words, the rate at which the object is moving is called speed

"Distance is the actual path length traveled by an object in the given interval of time during the motion. It is a positive scalar quantity."

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Answer:

A

C

D

A

Explanation:

______ are NOT a source of arsenic in the environment.

The policy change which was based on the results of the students’ water-testing project is:

Damage to the body’s _______ system can affect brain development, learning, and memory. *

The element arsenic is a ______. *

Pesticides are those chemicals which are used particularly in killing pests such as harmful insects which cause a nuisance to the environment.

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Answer:

50kgm/s

Explanation:

From the law of conservation of momentum, a system that starts with an initial momentum of 50kgm/s will end up with a momentum of 50kgm/s in its final state.

Answer:

Velocity

Explanation: If you are going down hill, (Which is one direction) you will gain more speed by, gravity, friction, and most importantly velocity.

Answer:

The height is "89.61 m". A further explanation is given below.

Explanation:

According to the question,

Mass of rocket,

m = 5 kg

Time,

t = 4.6 s

Initial speed of rod

u = o m/s

Final speed,

v = 39 m/s

drag,

= 60 N

So,

⇒ acceleration, [tex]a=\frac{v-u}{t}[/tex]

                              [tex]=\frac{39-0}{4.6}[/tex]

                              [tex]= 8.478 \ m/s^2[/tex]

⇒ [tex]F_{net}= Net \ force[/tex]

           [tex]=ma[/tex]

           [tex]=5\times 8.478[/tex]

           [tex]=42.89 \ N[/tex]

Now,

The thrust will be:

⇒ [tex]Thrust-weight-drag=Net \ force[/tex]

⇒ [tex]Thrust-(5\times 9.8)-60=42.89[/tex]

⇒           [tex]Thrust-49-60=42.89[/tex]

⇒                 [tex]Thrust-109=42.89[/tex]

⇒                           [tex]Thrust=42.89+109[/tex]

⇒                           [tex]Thrust=151.89 \ N[/tex]

The height will be:

⇒ [tex]h=\frac{1}{2} at^2[/tex]

      [tex]=\frac{1}{2}\times 8.47\times (4.6)^2[/tex]

      [tex]=\frac{1}{2}\times 8.47\times 21.16[/tex]

      [tex]=89.61 \ m[/tex]

Just find the density of every metal and select the one with a density of 2.71 g/cm³ . This is:

Metal 1

ρ = m/V

ρ = 22.1 g / 3 cm³

ρ = 7.367 g / cm³

Metal 2

ρ = m/V

ρ = 42 g / 4 cm³

ρ = 10.5 g / cm³

Metal 3

ρ = m/V

ρ = 9.32 g / 5 cm³

ρ = 1.864 g / cm³

Metal 4

ρ = m/V

ρ = 8.13 g / 3 cm³

ρ = 2.71 g / cm³

Answer:

Thank you and please rate me as brainliest as it will help me to level up

Answer:

So 55 Newtons are needed.

Answer:

80 N

Explanation:

mass (m) = 20kg

acceleration (a) = 4m/s^2

Force (F) = ?

.°. F = ma

= 20 × 4 = 80

.°. F = 80 N

Thus, The Force is needed to accelerate a 20 kg mass at a rate of 4 m/s^2 is 80 N

-TheUnknownScientist

Answer:

The new volume is the same as the initial volume, i.e. 20 mL.

Explanation:

To find the new volume we can use the Ideal gas law:

[tex] PV = nRT [/tex]

Where:

P: is the pressure

V: is the volume

R: is the gas constant

n: is the number of moles

T: is the temperature

Initially, we have:

[tex] \frac{P_{i}V_{i}}{T_{i}} = nR [/tex]    (1)

In the final state:  

[tex] \frac{P_{f}V_{f}}{T_{f}} = nR [/tex]    (2)

By equating equation (1) and (2) we have:          

[tex] \frac{P_{i}V_{i}}{T_{i}} = \frac{P_{f}V_{f}}{T_{f}} [/tex]  

[tex] \frac{P_{i}V_{i}}{T_{i}} = \frac{2P_{i}V_{f}}{2T_{i}} [/tex]  

[tex]V_{f} = \frac{2T_{i}*P_{i}*V_{i}}{T_{i}*2P_{i}}[/tex]

[tex] V_{f} = V_{i} [/tex]

[tex] V_{f} = 20.0 mL [/tex]

Therefore, the new volume is the same as the initial volume, i.e. 20 mL.

I hope it helps you!

Answer:

B. 24.2 m/s

Explanation:

Given;

mass of the roller coaster, m = 450 kg

height of the roller coaster, h = 30 m

The maximum potential energy of the roller coaster  due to its height is given by;

[tex]P.E_{max} = mgh\\\\PE_{max} = 450 *9.8*30\\\\PE_{max} = 132,300 \ J[/tex]

[tex]P.E_{max} = K.E_{max} \ (law \ of \ conservation\ of \ energy)[/tex]

[tex]K.E_{max} = \frac{1}{2}mv_{max}^2\\\\ v_{max}^2 = \frac{2K.E_{max}}{m}\\\\ v_{max}^2 = \frac{2*132300}{450}\\\\ v_{max}^2 =588\\\\v_{max} = \sqrt{588}\\\\ v_{max} = 24.2 \ m/s[/tex]

Therefore, the maximum speed of the roller coaster is 24.2 m/s.

Answer:

1. 24.2 m/s

2. 20.4 m

3. 22.5 m/s

4. 109,375 J

5. It is easy to calculate new scenarios.

Explanation:

5/5 on the Maximum Energy Quick Check

Answer:

Laws are statements about something that's been observed and stated while a theory is an explanation of what's been observed. This connection between them forms a main idea that many people regulate as "what's normal."

Explanation:

Answer:

A hypothesis is a limited explanation of a phenomenon; a scientific theory is an in-depth explanation of the observed phenomenon. A law is a statement about an observed phenomenon or a unifying concept, according to Kennesaw State University. ... However, Newton's law doesn't explain what gravity is, or how it works.

for e.g:

The particle theory and Darwin's theory of human origin.

Answer:

Refraction

Explanation:

A pencil bends when it enters the water media due to the phenomenon of refraction.

Answer: B: The car is speeding up in the same direction as it is traveling.

Explanation:

I took the test and got it right

Answer:

100% of the energy entering earth's atmosphere comes from the sun. ~50% of the incoming energy is absorbed by the earth's surface i.e. the land and oceans.

Answer:

Explanation:

All of these are examples of electromagnetic radiation or energy.

The spectra comprises most energy and matter we can account for so far.

The main distinction between EM waves and for example longitudinal acoustic waves is the medium of energy transfer (and rules). EMWs are subject to the idiosyncratic effects of Quantum Mechanics while other 'macro' waves whose medium relies on gross material, are apparently not.

Answer:

D. Flexible refrigerator magnets

B. Iron cooking pans

The strong magnet can attract other magnetic materials from the mixture. They are iron cooking pans and  flexible refrigerator magnets. Hence, options B and D are correct.

Magnetic materials are those having a permanent magnetic dipoles and produces strong magnetic field. Permanent magnets are ferromagnetic in nature. Their magnetic dipoles align along with the applied magnetic field.

A magnetic material can attract other magnet through their opposite poles in contact. Therefore, magnetic materials such as iron, nickel, etc.can be attracted by a bar magnet.

Here, the  flexible refrigerator magnets and the iron cooking pans would be attracted to the strong magnet and they can be separated from the other recyclable materials.

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Answer:

The change in kinetic energy of the car is -189434 joules.

The work done by the car is 189434 joules.

The magnitude of the force that pushed the front of the car is 498510.526 newtons.

Explanation:

Given that the car is moving on a horizontal ground, by the Principle of Energy Conservation and the Work-Energy Theorem we get the following identity:

[tex]\Delta K+\Delta W = 0[/tex] (1)

Where:

[tex]\Delta K[/tex] - Change in the translational kinetic energy of the car, measured in joules.

[tex]\Delta W[/tex] - Work done by the car, measured in joules.

By applying the defintions of translational kinetic energy and work, we expand and simplify the resulting equation:

[tex]\frac{1}{2}\cdot m \cdot (v_{f}^{2}-v_{o}^{2})+F\cdot \Delta s = 0[/tex] (2)

Where:

[tex]m[/tex] - Mass, measured in kilograms.

[tex]v_{o}[/tex], [tex]v_{f}[/tex] - Initial and final speeds of the car, measured in meters per second.

[tex]F[/tex] - Force exerted by the car, measured in newtons.

[tex]\Delta s[/tex] - Travelled distance of the front of the car, measured in meters.

The change in the kinetic energy of the car and the work done by the car are, respectively: [tex](v_{o} = 14\,\frac{m}{s}, v_{f}= 0\,\frac{m}{s}, m = 1933\,kg, \Delta s = 0.38\,m)[/tex]

Translational kinetic energy

[tex]\Delta K = \frac{1}{2}\cdot m\cdot (v_{f}^{2}-v_{o}^{2})[/tex]

[tex]\Delta K = \frac{1}{2}\cdot (1933\,kg)\cdot \left[\left(0\,\frac{m}{s} \right)^{2}-\left(14\,\frac{m}{s} \right)^{2}\right][/tex]

[tex]\Delta K = -189434\,J[/tex]

Work done by the car

[tex]\Delta W = -\Delta K[/tex]

[tex]\Delta W = 189434\,J[/tex]

Magnitude of the force

[tex]F = \frac{\Delta W}{\Delta s}[/tex]

[tex]F = \frac{189434\,J}{0.38\,m}[/tex]

[tex]F = 498510.526\,N[/tex]

The change in kinetic energy of the car is -189434 joules.

The work done by the car is 189434 joules.

The magnitude of the force that pushed the front of the car is 498510.526 newtons.

Answer:

v' = 1.21 m/s

Explanation:

Mass of a green ball, m = 0.525 kg

Mass of a blue ball, m' = 0.482 kg

Initial velocity of green ball, u = 2.26 m/s

Initial velocity of blue ball, u' = 0 (at rest)

After the collision,

The final velocity of the green ball, v = 1.14 m/s

We need to find the final velocity of the blue ball after the collision if the collision is head on. Let v' is the final velcity of the blue ball. Using the conservation of momentum to find it :

[tex]mu+m'u'=mv+m'v'\\\\0.525 (2.26)+0=0.525 (1.14)+0.482v'\\\\0.588=0.482v'\\\\v'=\dfrac{0.588}{0.482}\\\\v'=1.21\ m/s[/tex]

So, the final velocity of the blue ball is 1.21 m/s.