15. Find the speed of a disc of radius 0.5 meters and mass 2-kg at the base of the incline. The disc starts at rest and rolls down the incline with a height of 5 meters without slipping. The incline makes a 20° angle with the horizontal surface.​

Distance covered = (speed) x (time)

Time = (Distance covered) / (speed)

Time = (48 km) / (32 km/hr)

Time = (48/32) hr

Time = 1.5 hrs (1 hour 30 minutes)

Answer:

c

Explanation:

Answer:

a) The bullet will penetrate 0.375 meters into the bag of sand.

b) The average force exerted by the sand is 15 newtons.

Explanation:

The statement is incorrectly written. The correct form is presented below:

A bullet of mass 50 grams travelling with a speed of 15 meters per second penetrates into a bag of sand and is uniformly brought to rest in 0.05 second.

a) How far the bullet will penetrate into the bag of sand?

b) The average force exerted by the sand?

b) The average force exerted by the sand on the bullet ([tex]F[/tex]), measured in newtons, is determined by Principle of Linear Momentum Conservation and Impulse Theorem:

[tex]F = \frac{m\cdot (v_{f}-v_{o})}{\Delta t}[/tex] (1)

Where:

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

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

[tex]\Delta t[/tex] - Impact time, measured in seconds.

If we know that [tex]m = 0.05\,kg[/tex], [tex]v_{o} = 15\,\frac{m}{s}[/tex], [tex]v_{f} = 0\,\frac{m}{s}[/tex] and [tex]\Delta t = 0.05\,s[/tex], then the average force exerted by the sand is:

[tex]F = \frac{(0.05\,kg)\cdot \left(0\,\frac{m}{s}-15\,\frac{m}{s} \right)}{0.05\,s}[/tex]

[tex]F = -15\,N[/tex]

The average force exerted by the sand is 15 newtons.

a) The distance travelled by the bullet ([tex]\Delta s[/tex]), measured in meters, is determined by application of Principle of Energy Conservation and Work-Energy Theorem:

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

If we know that [tex]m = 0.05\,kg[/tex], [tex]v_{o} = 15\,\frac{m}{s}[/tex], [tex]v_{f} = 0\,\frac{m}{s}[/tex] and [tex]F = -15\,N[/tex], then the distance travelled by the bullet is:

[tex]\Delta s = \frac{(0.05\,kg)\cdot \left[\left(0\,\frac{m}{s} \right)^{2}-\left(15\,\frac{m}{s} \right)^{2}\right]}{2\cdot (-15\,N)}[/tex]

[tex]\Delta s = 0.375\,m[/tex]

The bullet will penetrate 0.375 meters into the bag of sand.

Answer:

2 atomic of phosphorus and 5 of oxygen

Explanation:

The numbers attached to the elements (ie. subscript) show the amount of atoms present for each element.

Answer:

image distance =-6.6 7cm

image size=1.3cm

Explanation:

Answer:

it has to be ''G''

Explanation:

.

Answer:

J

Explanation:

Sexual reproduction includes 2 parents but asexual reproduction only requires 1.

Answer:

The average speed of the blood in the capillaries is 0.047 cm/s.

Note: The question is incomplete. The complete question is as follows:

The radius of the aorta is about 1 cm and the blood flowing through it has a speed of about 30 cm/s. Calculate the average speed of the blood in the capillaries given the total cross section of all the capillaries is about 2000 cm².

Explanation:

From the given values:

radius of the aorta, r₁ = 1 cm

speed of blood, v₁ = 30 cm/s

Area of the aorta, A₁ = πr₁² where π = 3.142

Area of aorta = 3.142 × (1)² = 3.142 cm²

Area of the capillaries, A₂ = 2000 cm²

let the average speed of the blood in the capillaries = v₂

From the continuity equation of fluid flow, the product of cross-sectional area of the pipe and the fluid speed at any point along the pipe is always constant. In formula, A₁v₁ = A₂v₂

Using the continuity equation, the average the average speed of the blood in the capillaries can be calculated thus:

A₁v₁ = A₂v₂

v₂ = (A₁v₁) / (A₂)

v₂ = (3.142 x 30) / (2000)

v₂ = 0.047 cm/s

Therefore, the average speed of the blood in the capillaries is 0.047 cm/s.

Answer:

[tex] \boxed{q = 1.2 \times {10}^{ - 6} C}[/tex]

Explanation:

[tex]f_e = \frac{{q}^{2}k }{ {r}^{2} } \\ q = \sqrt{ \frac{f_e( {r}^{2} )}{k} } = \sqrt{ \frac{5.2(5 \times {10}^{ - 2} )^{2} }{9 \times {10}^{9} } } \\ q =\sqrt{ \frac{5.2(5 \times {10}^{ - 2} )^{2} }{9 \times {10}^{9} } } = \sqrt{ \frac{0.013}{9 \times {10}^{9} } } \\ q = 1.2 \times {10}^{ - 6} [/tex]

Answer: c

Explanation: for #5 it can still be moving, just at a constant speed; therefore, it will be c.

If an object has an acceleration of 0 m/s2, then one can be sure that the object is not changing velocity.

If car A passes car B, then car A must be moving faster than car B, but not necessarily accelerating.

The not consistent with a car that is accelerating is a car is moving at a high speed.

A fullback is running down the football field in a straight line. He starts at the 0-yard line at 0 seconds. At 1 second, he is on the 10-yard line; at 2 seconds, he is on the 20-yard line; at 3 seconds, he is on the 30-yard line; and at 4 seconds, he is on the 40-yard line. This is evidence that he is moving with a constant speed (on average).

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Answer:

trying to push a rock that never moves

Explanation:

let me try my best to break the concepts down for you.

the definition of work done is

work done by a constant force on an object is the product of the force and the distance moved by the object in the direction of the force.

this means that when you apply a force, it must move.

basically it is like holding a book in your hands and not moving, are you fighting the gravitational force?

when you push a box, it definitely moves in the direction you push right?

when you raise the barbel, you are applying a upward force, and barbel us moving upwards, so work is done

hope it helps, if not please report it so that someone else gets to try it

Answer:

MRI and Radio telescopes

MRI and radio telescopes would be unaffected by satellites that are not working properly.

The longest wavelengths in the electromagnetic spectrum are found in radio waves, which typically have frequencies of 300 gigahertz (GHz) and lower. The wavelength for 300 GHz is 1 mm, which is shorter than a grain of rice, while the wavelength for 30 Hz is 10,000 km (6,200 miles) (longer than the radius of the Earth).

Radio waves move at the speed of light in a vacuum, as do all electromagnetic waves, and at a nearly identical speed in the Earth's atmosphere.

Among the given options, space communication and television broadcasting television broadcasting and GPS  and  radio telescopes and space communication​ are affected by satellites that are not working properly because they are operated by satellite technology.

Hence, only MRI and radio telescopes would be unaffected by satellites that are not working properly.

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Answer:

1 m/s²

Explanation:

a = (Vf - Vi)/t

a = (3-1)/(2)

a = 2/2

a = 1 m/s²

I might be wrong ‍¯\_(ツ)_/¯

Answer:

A, B and D

2. A

Explanation:

1.Which of the following statements about light waves is true? check all correct answers

A.They come from sources across space reason is that a light can travels form its source and its moves across the space

B.They travel in a straight line from their source reason is that the type of light that undergo these is called parallel ray of light

C.They can travel through any type of material reason not all materials light can penetrate through e.g wall

D.They can be reflected by some types of material reason is that some materals reflect light rays e.g polished mirror

Answer:

Parasitic Relationship

A symbiotic relationship that is mutualism exists between the comma teasel and all of the other plants.

Symbiosis or symbiotic relationship is any type of close and long-term biological interaction which is present between two different biological organisms, be it mutualistic relationship, commensalistic relationship, or parasitic relationship. The organisms, each termed as a symbiont, must be of different species.

The comma teasel and all of the other plants share a relationship where, the comma teasel pollinates flowers of different plant species. Pollination is important for the reproduction in plants and in return, the plants provide nectar to the organism.

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Answer:

The answer should be the one on the top in the picture.

Explanation:

Friction is opposing the downward movement of the crate therefore the friction force is pointing upwards. that is why the answer should be the one on the top of the picture.

Answer:

x = 7226.94 m

y = 1677.4 m

Explanation:

This is a classic problem of a parabolic move. Let's analyze the given data.

The speed is 300 m/s but it's fired at 55°, so the x and y component of the speed would be:

Vx = 300 cos55 = 172.07 m/s

Vy = 300 sin55 = 245.75 m/s

Now, to get the x and y components of the shell, we need to apply the following expressions:

X = Xo + Vx*t    (1)

Y = Yo + Vy*t - 1/2 gt²   (2)

Xo and Yo is 0, and we already have the speed in x and y, so the components are:

X = 0 + (172.07)(42)

For the y component:

Y = 0 + (245.75)(42) - 1/2 (9.8)(42)²

Y = 10321.5 - 8643.6

Hope this helps

Answer:

LOL i belive its 200 because i did this exact same thing yesterday for homework and got it right bcs i got it lol, yw btw! hahaha! good luck also, subscribe to my channel!

Explanation:

Answer:

acceleration is the rate of change of velocity

therefore in the above statement, the velocity increases twice per second.

when acceleration is negative, then it is accelerated motion.

ie. the car accelerates twice per second

Answer:

Newton's Third Law of Motion

Explanation:

Newton's Third Law of Motion which states that, for every action there is an equal but opposite reaction.

This ultimately implies that, in every interaction, there is a pair of forces acting on the two interacting objects.

In this scenario, a ball bounced by a basketball player on the floor bounces back up at her.

According to Newton's Third Law of Motion, the statement above simply means that in every interaction, there is a pair of forces acting on the two interacting objects i.e the ball and floor. The size of the force on the ball equals the size of the force on the floor. These two forces are called action and reaction forces and are the subject of Newton's third law of motion.

Hence, the ball bounced by the basketball player on the floor would bounce back in equal magnitude.

Answer:

C

Explanation:

potential energy is stored energy that an object has due to its position or chemical composition. Since the truck has the possibility to move down the hill when it is at the top of the hill, it has a great amount of potential energy, howver when its at the bottom of the hill, it doesn’t have the possibility to move or can move v little due to its positions,  therefore it has little to no potienatal energy.

The truck's potential energy is greater at the top of the hill compared to when it is at the bottom of the hill. Option (C) is correct.

The energy held within an object is known as potential energy. There are several different types of potential energy, including gravitational potential energy, elastic potential energy, and electric potential energy.

Here, the energy that an object possesses as a result of its position in relation to other objects is referred to as its gravitational potential energy.

A truck is parked at the bottom of a hill. It moves from the bottom of a hill and parks at the top.  its height increases, do, its potential energy also increases. The truck's potential energy is greater at the top of the hill compared to when it is at the bottom of the hill.

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Answer:

its d on edge c:

Answer:

In an emergency, a driver must bring their vehicle to a stop in the shortest distance possible.

Stopping distance = thinking distance + braking distance

This is when:  thinking distance is the distance a vehicle travels in the time it takes for the driver to apply the brakes after realizing they need to stop .

braking distance is the distance a vehicle travels in the time after the driver has applied the brake .

Reaction times vary from person to person, but are typically 0.2 seconds (s) to 0.9 s. A driver's reaction time can be affected by:

-tiredness

-drugs

-alcohol

-distractions

Longer reaction times increase the thinking distance when stopping from a given speed.

There are different ways to measure reaction times. One simple method involves dropping a ruler between someone's open thumb and forefinger. The further the ruler falls before being stopped, the higher the reaction time of the person grabbing the ruler. The ruler can be marked in s rather than in mm.

Plot a graph, constant speed of movements represented as straight lines. Time on X axis (seconds)  and position on Y axis (metres) , calculated by moving, e.g 4metres in a second.

Answer:

Explanation:

This is a fast plane! At it's takeoff speed, it could fly around the world in 5 seconds!

Acceleration is defined as the change in speed over the change in time.

[tex]a = \frac{v_f - v_o}{t}[/tex]

Where v_f is the final velocity, v_o is the original velocity, and t is the time.

We know v_f = 8820km/s.

v_o = 0 km/s. The plane "starts at rest before it's engine start." So we know it starts from zero velocity.

t = 32.8 seconds.

You can solve the equation from there.

Explanation:

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Light

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cee

Hi

Differentiate between luminous and non luminous objects.user

cee

The difference between luminous and non-luminous objects are -:

1. Luminous objects are the objects which emit light energy by themselves are called luminous objects. Whereas, non-luminous objects are the objects which does not emit light energy by themselves. 2) Luminous objects cause the sensation of light. Whereas, non-luminous objects do not cause the sensation of light. 3) Luminous objects are seen on their own. Whereas, non-luminous objects are seen due to luminous objects. 4) Examples of luminous objects are sun, candle, electric bulb. Whereas, examples of non-luminous objects are the moon, chair, plants.

Answer:

Explanation:

Objects that can emit light energy by themselves are known as luminous objects.  These objects can cause the sensation of light.Objects that cannot emit light energy by themselves are known as non-luminous objects.These objects do not cause the sensation of light.

Answer:

the sand will heat up faster than the water

Explanation:

water has slow heat conduction

and sand had high heat conduction

Answer:

The electron affinity of an atom or molecule is defined as the amount of energy released when an electron is attached to a neutral atom or molecule in the gaseous state to form a negative ion.

Answer:

Input Output

1 ft-lb 12 in-lb

1 in-lb 0.113 Nm

1 Nm 0.7376 ft-lb

1 in-lb 0.0833 ft-lb

1 ft-lb 1.3558179 Nm

1 in-lb 15.999999461875 in-oz

1 Nm 8.850746106833 in-lb

1 l-atm 101.325 J

1 Nm 3.72506E-7 hph

1 J 1 Nm

Explanation:

please mark as briliant

Answer:

1N-m

Explanation:

teacher just taught this an hour ago for my class

Answer:

The weight is distributed throughout the airplane, but we can often think of it as collected and acting through a single point called the center of gravity. In flight, the airplane rotates about the center of gravity, but the direction of the weight force always remains toward the center of the earth.

Explanation:

Answer:

C.) To indicate different versions of the same variable.

Explanation:

Variables in physics often include a subscript. These subscripts are used for indicating different versions of the same variable in physics.

Basically, subscripts are used to represent the beginning (initial) and ending (final) position or point of a variable in physics.

For example, we would look at Gay Lussac' Law of gases.

Gay Lussac law states that when the volume of an ideal gas is kept constant, the pressure of the gas is directly proportional to the absolute temperature of the gas.

Mathematically, Gay Lussac's law is given by;

[tex] PT = K[/tex]

[tex] \frac{P1}{T1} = \frac{P_{2}}{T_{2}}[/tex]

Where;

[tex] T_{1} [/tex] represents the initial temperature.

[tex] T_{2} [/tex] represents the initial temperature.

[tex] P_{1} [/tex] represents the initial pressure.

[tex] P_{2} [/tex] represents the initial pressure.

Note: 1 and 2 are the subscript while T and P are the variables.