what type of object is called the object at rest​

Explanation:

A roller coaster is released from the top of a track that is 125 m high. Find the roller coaster speed when it reaches ground level. 75. A 1500 kg car, moving at a speed of 20 m/s comes to a halt. How much work was done .

The roller coaster speed when it reaches to ground level is 15.65 m/sec

Given-

Roller coaster is released at a height of 125 meters.

It is known that, square of the final velocity [tex]v[/tex] of the body is equal to the sum of the square of initial velocity [tex]v_{10}[/tex] and the product of the twice of acceleration [tex]a[/tex] and displacement [tex]d[/tex]. It can be written as,

[tex]v^{2} =v_{0}^2+2ad[/tex]

Roller coaster released from rest therefore initial velocity is zero.

[tex]v^{2} =0+2ad[/tex]

[tex]v^{2} =2ad[/tex]

Roller coaster will fall towards the ground with an acceleration equal to gravity g and height of 125 m. therefore,

[tex]v^{2} =2\times g\times 125[/tex]

[tex]v^{2} =2\times 9.8\times 125[/tex]

[tex]v^{2} =2450[/tex]

[tex]v=15.65[/tex]

Hence, the roller coaster speed when it reaches to ground level is 15.65 m/sec.

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Answer:

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Answer:

see below

Explanation:

2 Hz, means 2 complete waves are produced in one second, so

2 waves ----- 1 second

2 x 60 -------1 x 60

120 waves ------60 seconds

hope this helps,

please mark it

Given:

Frequency= 2Hz

Number of waves = ?

= 120 waves

Therefore, the number of waves that will be formed in one minute is 120 waves

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Answer:

length, width, thickness, mean diameter

mass, volume, density, sphericity, surface area, aspect ratio.Jan 7, 2019

Explanation:

Answer:

Since, In Chemical change the property of the substance is changed resulting in the formation of a new substance where as In Physical change the property of the substance remains unchanged resulting in the formation of no new substance. Therefore, Cutting of Carrot is a physical change.

Explanation:

hope this helps    :)

Answer:

This came to mind

Explanation:

when a cannon fires (in real life or in the movies) have noticed that the cannon recoils, sliding backwards after the explosion. Again, a non-zero net force on the cannon changes its momentum.

Answer:

C-Electricity will flow if the electrons are bound tightly to their atoms in the material.

Explanation:

The flow of electricity through a material is determined by the condition of the electron which make of the atoms of the material. For example, in iron metal, the electron of the material is bounds tightly to their atoms. Do to this reason, the electricity can flow freely inside them unlike the plastic material which has no tightly bound electrons.

Answer:

do u still need the answer it has been 2 weeks ?

Explanation:

Answer:

u wanna play some blox?

Explanation:

Answer:

Only at point a

Explanation:

If the velocity is greater than zero, than the object must be moving.

Answer:

85.8 m/s

Explanation:

We know that the length of the circular path, L the plane travels is

L = rθ where r = radius of path and θ = angle covered

Now,its speed , v = dL/dt = drθ/dt = rdθ/dt + θdr/dt

where dθ/dt = ω = angular speed = v'/r where v' = maximum speed of plane and r = radius of circular path

Now, from θ = θ₀ + ωt where θ₀ = 0 rad, ω = angular speed  and t = time,

θ = θ₀ + ωt = 0 + ωt = ωt

So, v = rdθ/dt + θdr/dt

v = rω + ωtdr/dt

v = (r + tdr/dt)ω

v = (r + tdr/dt)v'/r

v = v' + tv'/r(dr/dt)

v = v'[1 + t(dr/dt)/r]

Given that v' = 110 m/s, t = 33.0s, r = 120 m and dr/dt = rate at which line is shortened = -0.80 m/s (negative since it is decreasing)

So, v = 110 m/s[1 + 33.0 s(-0.80 m/s)/120 m]

v = 110 m/s[1 + 11.0 s(-0.80 m/s)/40 m]

v = 110 m/s[1 + 11.0 s(-0.02/s)]

v = 110 m/s[1 - 0.22]

v = 110 m/s(0.78)

v = 85.8 m/s

Answer:

142.7650889

Explanation:

I think the answer above is correct. So to find the velocity of the wave you can do: frequency*wavelength = velocity

in your case, the velocity is equal to 403.5m/s

so we know that the 403.52 is the total velocity of the wave

and the equation: velocity at 0 degrees Celsius * [tex]\sqrt{{T}/{273}}[/tex] where T represents temperature in Kelvins = veloctity

so we set 403.52 = 327*[tex]\sqrt{{T}/{273}}[/tex] and solve for T

T will then equal the degree in Kelvins

so to convert from Kelvins to degrees celsius you subtract 273 from the Kelvins value and you are left with the degrees in Celsius which equals 142.7650889 degrees Celsius

Answer:

yes he does

Explanation:

Answer:

The combined velocity of Sally and the sled is 1.688 meters per second.

Explanation:

Let suppose that Sally collides inelasticly, meaning that final velocity of Sally-sled system can be determined solely by Principle of Momentum Conservation:

[tex]m_{S}\cdot v_{S, o} + m_{s}\cdot v_{s,o} = (m_{S}+m_{s})\cdot v[/tex] (1)

Where:

[tex]m_{S}[/tex] - Mass of Sally, measured in kilograms.

[tex]m_{s}[/tex] - Mass of the sled, measured in kilograms.

[tex]v_{S,o}[/tex] - Initial velocity of Sally, measured in meters per second.

[tex]v_{s,o}[/tex] - Initial velocity of the sled, measured in meters per second.

[tex]v[/tex] - Final velocity of the Sally-sled system, measured in meters per second.

If we know that [tex]m_{S} = 54\,kg[/tex], [tex]m_{s} = 10\,kg[/tex], [tex]v_{S,o} = 2\,\frac{m}{s}[/tex] and [tex]v_{s,o} = 0\,\frac{m}{s}[/tex], then the final velocity of the system is:

[tex]v = \frac{m_{S}\cdot v_{S,o}+m_{s}\cdot v_{s,o}}{m_{S}+m_{s}}[/tex]

[tex]v = 1.688\,\frac{m}{s}[/tex]

The combined velocity of Sally and the sled is 1.688 meters per second.

Answer:

v_f = 3 m/s

Explanation:

From work energy theorem;

W = K_f - K_i

Where;

K_f is final kinetic energy

K_i is initial kinetic energy

W is work done

K_f = ½mv_f²

K_i = ½mv_i²

Where v_f and v_i are final and initial velocities respectively

Thus;

W = ½mv_f² - ½mv_i²

We are given;

W = 150 J

m = 60 kg

v_i = 2 m/s

Thus;

150 = ½×60(v_f² - 2²)

150 = 30(v_f² - 4)

(v_f² - 4) = 150/30

(v_f² - 4) = 5

v_f² = 5 + 4

v_f² = 9

v_f = √9

v_f = 3 m/s

Answer:

A. A train traveling 60 miles per hour.

Explanation:

Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.

Mathematically, momentum is given by the formula;

[tex] Momentum = mass * velocity [/tex]

This ultimately implies that, the mass of an object or body is directly proportional to its momentum. Thus, the higher the mass of an object or body, the greater would be its momentum and vice-versa.

Hence, a train traveling 60 miles per hour would have the most momentum because it has the greatest mass among the other objects (options).

Answer:

Wood, metal, Stone

Explanation:

Answer:

Thermal resistance,Specific Heat Capacity,Density

Explanation:

Answer:

1 is community 2 habitat 4 producer 5 consumer 6 food chain 7 predator 8 prey sorry I don't know 4

Answer:

ikn

Explanation:

Answer:

the distance is 15+20=35 cm

Answer:

Reigon 1

Explanation:

It has the higest rate of landslides currently

Answer:

hh

Explanation:

Answer:

1. 7.5 km/h

2. 1 hour, 52 minutes, 30 seconds

3. 0.8 Joules

4. 13.33 mph

5. 19456 Joules

6. 10.5 kg

Explanation:

Answer:

a change of position in relation to another object.

Explanation:

Motion can be defined as a change in the location (position) of a physical object or body with respect to a reference point.

This ultimately implies that, motion would occur as a result of a change in location (position) of an object with respect to a reference point or frame of reference i.e where it was standing before the effect of an external force.

A reference point refers to a location or physical object from which the motion (movement) of another physical object or body can be determined.

Mathematically, the motion of an object is described in terms of acceleration, time, distance, speed, velocity, displacement, position, etc.

Hence, motion is a change of position in relation to another object.

When you get out of bed in a morning it's most likely too be cold so your bare feet on a floor not carpet a bare floor will feel cold since the temperature and molecules had changed and if you step on a warm fuzzy rug it will feel warm since your feet are cold and the rugs fuzziness or material keeps you warn

We feel more cold on feet on morning because heat from our feet will flow to the cold floor. We feel more cold on the bare floor than the rug since it conducts heat away from our feet.

Heat will be transfer on a temperature gradient from one substance to the other.  Heat is transferring from the hot body to the colder body. There are three types of heat transfer are there namely, conduction, convection and radiation.

Conduction is the heat transfer in solids , convection in liquids and radiation is the heat or energy transfer mode in gases and vacuum.  At the morning, the floor will be more cool whereas our body will be hotter, thus heat will flow our body to floor make our feet cool.

A bare floor will conduct thermally more than a rug do. Thus the bare floor conducts heat away from our feet and make our feet more cool.

To find more on heat transfer, refer here:

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Answer:

Which uses direct current - A flash light.

Explanation:

Hope you have a great day.

Answer:

Explanation:

it seems white because once it falls or hits the bottom bubbles are created and it makes it look white

Answer:

However, when water flows rapidly, its flow becomes turbulent. This sort of aeration creates tons of small bubbles in water, which are eventually responsible for the white color of waterfalls.

Answer:

If you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected. Since compasses work by pointing along magnetic field lines, this means that there must be a magnetic field near the wire through which the current is flowing

Explanation:

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