how much time does it take for a student running at an average speed of 5 ms to cover a distance of 2km

Answer:

Choose aerobic activities such as walking.

Exercise for at least 30 minutes on all or most days of the week.

Cut back on junk food.

Eat smaller food portions.

Increase the amount of fresh fruits and vegetables, lean meats, low-fat dairy products and wholegrain foods in your daily diet.

Explanation:

this is the correct answer

The system that is colliding maintains its momentum. As a result, the ball B's speed is 2m/s (option -a) when it has the same mass as the ball A.

A body's capacity to produce the greatest displacement from an applied force is known as momentum. It is the result of adding mass and speed. The two bodies' total initial momentum and total final momentum are equal in a collision.

Consequently, let u be the starting velocity and v be the ending velocity.

m₁ u₁+ m₂ u₂ = m₁ v₁ + m₁ v₂

m₁ =  0.17 kg

u₁ = 4 m/s

m₂ = 0.17 kg

u₂ = 0

Then initial momentum = 0.17 × 4 m/s + 0 = 0.68 kg m/s

v₁ = v₁ cos 30° = 3.5×√3/2

v₂ = v₂cos 60 = v/2

0.68 kg m/s = (0.17 × 3.5×√3/2 ) +  (0.17 × v₂/2)

3.5×√3/2/2 + v₂/2 = 4

3.5√3 + v₂ = 8

then v₂ = 8-3.5(1.732)

v₂ = 1.94m/s. = 2m/s

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Answer:

Answer is radiant and chemical.

Hope this help:)

Sry if wrong

Answer:

Its D

Merry Christmas!!!!

Explanation:

Also I got this question right I had it for an assignment

The flaw in the experiment on water recycling is that the student did not see water dripping off the glass plate as expected. To correct this flaw, the student should use a cold glass plate instead of a hot glass plate.

The correct option to the given question is option 4.

When the student holds the hot glass plate above the beaker, the water vapor in the atmosphere will come into contact with the cold surface of the plate and condense, forming water droplets. However, if the glass plate is already hot, it will not be able to cool down the water vapor quickly enough for condensation to occur.

By using a cold glass plate, the temperature difference between the plate and the water vapor will be greater, allowing for faster condensation. This will result in water droplets forming on the glass plate and dripping off, demonstrating the process of water recycling through the atmosphere.

Therefore, the correct method to correct the flaw in this experiment is to use a cold glass plate instead of a hot glass plate. This will enable the student to observe water droplets on the glass plate as expected.

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The element that forms at the core of a red giant star is helium. When a star has exhausted all the hydrogen in its core, it begins to fuse helium atoms together to form heavier elements such as carbon and oxygen.

This fusion process releases energy, causing the outer layers of the star to expand and cool, resulting in the star becoming a red giant. As the helium is depleted in the core, the star will continue to fuse heavier elements until it reaches iron, which cannot be fused without consuming more energy than it releases. At this point, the star will undergo a supernova explosion, leaving behind a remnant such as a neutron star or black hole. Thus, the formation of helium at the core of a red giant star plays a crucial role in the evolution of stars and the creation of heavy elements in the universe.

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In audio signal processing and acoustics, an echo is a reflection of sound that arrives at the listener with a delay after the direct sound.

Echo Time taken = 2×  Distancetraveled  ÷ velocity of sound

velocity = 115 ÷ 3= 38.33

∴echo time= 2×12÷38.33

=0.0062s

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​

If the mixture is thermally isolated from its surroundings, then it, loses thermal energy to the environment outside as it comes to a final temperature. The correct answer is d.

When the sample of lead is placed in the water, heat will flow from the lead to the water until they reach a common final temperature. Since the final temperature will be less than the initial temperature of the lead, heat must have flowed out of the lead into the surroundings, causing the lead to lose thermal energy to the environment outside the system.

Since the mixture is thermally isolated from its surroundings, no thermal energy is exchanged between the system (lead and water) and the environment during the process. However, heat can still flow within the system itself until thermal equilibrium is reached. Option d is correct.

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Answer:

Mass, M = 0.75kg

Explanation:

Kinetic energy can be defined as an energy possessed by an object or body due to its motion.

Mathematically, kinetic energy is given by the formula;

\( K.E = \frac{1}{2}MV^{2}\)

Where, K.E represents kinetic energy measured in Joules.

M represents mass measured in kilograms.

V represents velocity measured in metres per seconds square.

Given the following data;

Kinetic energy = 150J

Velocity = 20m/s

Making mass the subject formula;

\( M = \frac{2K.E}{V^{2}}\)

Substituting into the equation, we have;

\( M = \frac{2*150}{20^{2}}\)

\( M = \frac{300}{400}\)

Mass, M = 0.75kg

The correct answer is option C, a = 5/3 g sin θ. This formula takes into account the acceleration due to gravity, the angle of the incline, and the fact that the sphere is rolling without slipping.

Gravity is a natural phenomenon by which all physical bodies attract each other. It is most commonly experienced as the force that gives weight to objects with mass and causes them to fall towards the ground when dropped. It is the reason why objects stay in motion until they are either acted upon by another force or are stopped by a surface.

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Answer:

8km/h

Explanation:

Time=8:30 - 7:00 = 1.5 hours

Distance = 12 km

Speed = Distance / Time

=12/1.5

=8 km/h

Answer:

The value of mass 1, m1= 6/5m

The value of mass 2, m2= 3/5m

Explanation:

case 1:

here tension and the acceleration will be:

for m1;

for m2:

adding the both equations,

2mg - 2T + 2T-mg = 2ma + ma/2

a = 2/5 g

putting the value of a into the equation 1.

mg - T = m* (2/5)g

T = 3/5 ( mg )

now

case 2:

The two identical blocks are released from the rest, the tension remains the same as the case 1.

so,

for m1:

for m2:

adding both equations we get,

2T-m2g + 2m2g - 2T = 0

m2 = m1 / 2

T = m1*g / 2

here we know that

T (case1) = T (case2)

3/5 ( mg ) = m1*g / 2

m1 = 6/5 m

hence

m2 = 3/5 m

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Based on leah's informal experiment we can say, unbalanced forces from Joey pushing the car causes the car to change direction.

Forces that are opposite in direction and equal in size are termed as balanced forces. Since the car move across the table with constant speed, we can say acceleration is zero and net forece is also zero, until and unless Joey or Leah push the car. To change the direction and speed of the car, a net external force is required to be acted upon the car. A net external force by Joey is an unbalanced force which will change the direction and gives the speed to the car in opposite direction. Hence, it is an unbalanced force applied by the Joey that pushes the car in the other direction. Due to this force car starts to move back to Leah. Without, unbalanced force there will be no change in the direction of the car's motion or speed.

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Answer:

A

Explanation:

Current effiency

= 75/147

= 0.5102

New Efficiency

= 120/100 × 0.5102

= 0.6122

Only option A satisfies this efficiency.

Answer:

Explanation:

operantly conditioned; positively reinforced

The measurement of the length of a swimming pool, the SI unit is meters (m).

In the International System of Units (SI), the standard unit for measuring length is the meter (m). The meter is defined as the distance travelled by light in a vacuum during a specific time interval. It is widely used for measuring various lengths, including the length of a swimming pool.

When measuring the length of a swimming pool, you would typically use meters as the unit of measurement. This is because meters provide a convenient and standardized way to express distances. A swimming pool's length can be measured by physically stretching a measuring tape or using a measuring device calibrated in meters.

Using the SI unit of meters allows for consistency and compatibility when communicating measurements across different contexts and disciplines. It enables accurate and precise comparisons, calculations, and analysis of length-related quantities.

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Answer:

What is an electromagnetic wave

Explanation:

Electromagnetic radiation is also more commonly known as light, light travels in waves- and light travels at the same speed as electromagnetic waves. :)

Answer:

it would

Explanation:

this is because as something rubs against a surface fast, friction heats it up, like when you rub a surface fast and it gets warm on the palm of your hand, that is friction. hope it helped :)

The rate of shortening of the elastic cord at r = 1.2 m is 6.25 m/s. The rate of shortening of the elastic cord at r = 1.2 m is 0.208 m/s

\(KE_i\)= (1/2)mv² = (1/2)(5 kg)(5 m/s)² = 62.5 J

PE = (1/2)k(r - \(r_0\))²

(1/2)mv² = (1/2)k(r - \(r_0\))²

Solving for v, we get:

v = √(k/m)(r - \(r_0\))²)

At r = 1.2 m, the speed of the disk is:

v = √((k/5 kg)(1.2 m - 0.5 m)²) = 3.83 m/s

\(L_i = Iw_i =\)(1/2)mr²(0) = 0

\(L_i = L\)

0 = (1/2)mr_i²\(w_i\)= (1/2)\(mr_f\)²\(w_f\)

Solving for ω_f, we get:

\(w_f = (r_i/r_f)w_i\)

\(v_r = rw_f = (r_i/r_f)r_iw_i\)

Substituting the given values, we get:

\(v_r\) = (1.5 m/1.2 m)(1.5 m)(5 m/s)/(1.5 m) = 6.25 m/s

At r = 1.2 m, we have:

dl/dt = (1.2 m - 1.5 m) / √[(1.2 m - 1.5 m)² + (1.0 m)²] × (v/r) = -0.208 m/s

An elastic cord refers to a flexible material that can stretch and then return to its original shape and length when a force is applied and then removed. The behavior of an elastic cord can be described by Hooke's law, which states that the force applied to an elastic material is proportional to the amount of stretch or compression produced.

The elastic cord has many practical applications, such as in bungee jumping, where the cord is stretched and then allowed to contract rapidly, producing a thrilling and exciting experience. It is also used in medical devices, such as braces and orthotics, to provide support and compression to the affected area. The elasticity of the cord depends on the material used and the thickness of the cord. Rubber and latex are common materials used to make elastic cords due to their high elasticity and ability to stretch without breaking.

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true

Explanation:

this is because melting point and boiling point decreases down the group because they are held together by attractions between positive nuclei and delocalised electrons

Answer:

See below

Explanation:

The ammeter (or the protective fuse inside)  will get fried.....nearly ideal means it has VERY little resistance....the current flow will almost be a short circuit

Since an ammeter is designed to measure current, it will accurately measure the current flowing through the circuit.

The current flowing through the circuit, which in this instance would be the current supplied by the automobile battery, will be precisely measured by an ammeter because it is intended to detect current.

According on the battery's charge level and the electrical requirements of the linked components, the ammeter would display the value of the current flowing through it, which may range from tens to even hundreds of amperes.

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The puck must rotate with a speed of 3.44 m/s to keep the hanging block at rest.

To keep the hanging block at rest, the tension in the string must be equal to the weight of the block. We can start by finding the tension in the string using the weight of the hanging block:

T = mg = (1.20 kg)(9.81 m/s^2) = 11.77 N

The tension in the string provides the centripetal force that keeps the puck moving in a circle. The centripetal force is given by:

F = ma = m(v^2/r)

where m is the mass of the puck, v is its speed, r is the radius of the circle, and a is the centripetal acceleration.

Solving for v, we get:

v = sqrt(ra) = sqrt(r(T/m)) = sqrt((0.40 m) × (11.77 N)/(0.20 kg)) = 3.44 m/s

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The period of a pendulum is affected by its length, mass, and the acceleration due to gravity (g). From this problem, we have measured the periods of several pendulums of different lengths.

We have to analyze the data by fitting to a power law, y = a L b. Let us begin by recalling the equation for the period of a pendulum:

\(T = 2π (L/g)^1/2\) Here, T is the period of the pendulum L is the length of the pendulum g is the acceleration due to gravity (which is to be determined).

Substituting the power law, y = a L b in the equation above, we get:

\(2π (L/(a/y^b))1/2 = T2π (y^b/a)^1/2 L^1/2 = Tg = 4π² L/aT²y^b\) Hence, the value of the acceleration due to gravity (g) can be inferred from the equation above as:

\(g = 4π² L/aT²y^b\)

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Answer:

21.2m/s

Explanation

Given data

P=6.36 x 10⁴kg·m/s.

M=3000kg

From the momentum expression

P=mv

v=p/m

Substitute

v=63600/3000

v=21.2m/s

Hence the Velocity is 21.2m/s

The speed of the truck is 21.2 m /s

Momentum is the product of the mass of the object and the velocity of the object. Therefore,

p = mv

where

m  = mass

v = velocity

m = 3000 kg

p = 6.36 x 104 kg·m/s.

lets find the velocity

6.36 x 10⁴  = 3000 × v

v = 6.36 x 10⁴ / 3000

v = 21.2 m / s

The speed of the truck is 21.2 m /s

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the velocity of the wave is 400m/s

The formula for the velocity of the wave is, V = w/k

where ,  w is the coefficient of t and k is the coefficient of x

now putting values we get, v = 200/0.5 = 400

Hence the velocity of the wave is 400 m/s

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160000 kgm/s is the impulse of the car. ​

J=mΔv

I= impulse

m= mass= 2000kg

Δv=  change in velocity= 80 km

J=mΔv

I= 2000kg×80 km/s

I=160000 kgm/s

The concept of impulse is used to describe how a net force affects an item (a kind of "moving force"). Impulse is denoted by the letter J.  The average net force acting on an item over time is calculated as an impulse. The force-time integral is J = Ft. The vector quantity of impulse is J = F dt (since force is a vector and time is a scalar).

Theorem of Impulse-Momentum According to the impulse-momentum theorem, an object's change in momentum equals the impulse that was delivered to it. J = ∆p The newton second is the SI unit for impulse. The kilogram meter per second is the SI unit for momentum. These momentum and impulse units are the same.

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Answer:

Explanation:

the street and the clouds

Human activities can increase landslide chances because it is responsible for clear-cutting, mining and quarrying, bad agricultural practices, and construction activities.

Yes, in some cases, human activities can give to causing landslides. Many human-caused landslides can be kept away from or mitigated. They are usually a result of building roads and structures without adequate grading of slopes, badly planned alteration of drainage patterns and disturbing old landslides.

In the study area, landslides seriously threaten the safety of people's lives and things and endanger transportation infrastructures. huge rainfall, an earthquake, or a combination of both commonly trigger a landslide.

So we can conclude that Some human activities, especially road construction, farmland allowance for building construction, and agricultural reclamation.

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