How should ready-to-eat food be stored after it has cooled?

Answer:

v_f = 10.85 m/s

Explanation:

We will apply the law of conservation of momentum here:

[tex]m_{1}v_{1i} + m_{2}v_{2i} = m_{1}v_{1f}+m_{2}v_{2f}\\[/tex]

where,

m₁ = mass of roller skater = 47 kg

m₂ = mass of bag = 6 kg

v_1i = initial speed of roller skater = 12 m/s

v_2i = initial speed of the bag = 0 m/s

v_1f = final speed of the roller skater = ?

v_2f = final speed of the bag = ?

Both the bag and the skater will have same speed at the end because kater is carrying the bag:

v_1f = v_2f = v_f

Therefore, the equation will become:

[tex](47\ kg)(12\ m/s)+(6\ kg)(0\ m/s)=(47\ kg)(v_{f})+(5\ kg)(v_{f})\\564\ N.s = (47\ kg+5\ kg)(v_{f})\\v_{f} = \frac{564\ N.s}{52\ kg}\\[/tex]

v_f = 10.85 m/s

they are right it's mixture

Answer:

Calcium is less reactive than strontium.

hope it helps

Answer: This is true

Explanation: v2=800/25= 32m/s

Answer:

last one

Explanation:

Answer:

Decrease

Explanation:

Answer:

inertia

..............

Answer:law of inertia

Explanation:

Answer:

12 N to the Right

Explanation:

12 N is the answer for the first box and right is the answer for the second box

Answer:

the final velocity of the bus is -20 m/s.

Explanation:

Given;

initial velocity of the bus, u = 20 m/s

deceleration of the bus, -a = 8 m/s²

time of motion, t = 5 s

The final velocity of the bus is calculated as;

v = u + at

v = 20 + (-8 x 5)

v = 20 - 40

v = -20 m/s.

Therefore, the final velocity of the bus is -20 m/s.

Answer:

Atomic mass 5

Explanation:

No. protons=Atomic mass

Answer:to protect an electrical circuit from damage caused by excess current from an overload or short circuit.

Explanation:

Answer:

D

Explanation:

the man is pull the box that is the force and the box rubbing against the ground causes friction

Answer:

Force = Mass x Acceleration. Since the acceleration of gravity is always constant at 9.81 m/s2, the force of gravity is constant as well, according to Newton. If the object is sitting motionless on the ground, then the net force (sum of all forces) acting on it is zero

Explanation:

sorry if it doesn't help

Answer:

Helium nuclei will split to form hydrogen and the sun will no longer release energy.

Explanation:

:)

When all the hydrogen in the sun has gone for fusion, helium nuclei will split to form hydrogen and the sun will continue to release energy.

The term nuclear fusion has to do with the combination of two or more nuclei to obtain a larger nuclei with the emission of a tremendous amount of energy.

Hence, when all the hydrogen in the sun has gone for fusion, helium nuclei will split to form hydrogen and the sun will continue to release energy.

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Answer:

the heat of the light.

Explanation:

no matter the light, there's always heat being produced from it. and heat makes liuqid rise

Answer:

The Sun is the Ultimate Source of Energy. Every morning the sun rises, bringing light and heat to the earth, and every evening it sets. ... Plants convert light energy from the sun into chemical energy (food) by the process of photosynthesis. Animals eat plants and use that same chemical energy for all their activities.

Answer:

10 kg rock at 15 degrees

Explanation:

did test

Answer:

The distance the bird flew is approximately 2.59 meters

Explanation:

We list out the parameters in the question, and the required measurement as follows;

The mass of the Cuban bee hummingbird, m = 1.7 g = 0.0017 kg

The amount of work the bird does, W = 8.8 × 10⁻⁴ J

The amount of upward force the bird exerts, F = 3.4 × 10⁻⁴ N

Let 'd' represent the distance flown by the bird

(The downward force, [tex]F_g[/tex] = The weight of the bird, W

W = The mass of the bird, m × The acceleration due to gravity, g

The acceleration due to gravity, g ≈ 9.81 × 10 m/s²

∴ [tex]F_g[/tex] ≈ 0.0017 kg × 9.81 m/s² = 0.016677 N > F)

Given that the weight of the bird is larger than 'F', we assume that the force exerted by the bird is the net force, [tex]F_{NET}[/tex] = F

Therefore;

Work done, W = Net Force, [tex]F_{NET}[/tex] × Distance, d

∴ W = [tex]F_{NET}[/tex] × d

d = W/[tex]F_{NET}[/tex] = 8.8 × 10⁻⁴ J/(3.4 × 10⁻⁴ N) = 2.58823529 meters

The distance the bird flew, d ≈ 2.59 m.

Answer:

1. Two materials that can be scratched by an iron nail are zinc and aluminum

2. A substance that can be scratched by an iron nail but not a penny is;

Nickel

Explanation:

The hardness of a material can be defined as its ability to resist being plastically deformed at a location due to mechanical scratching, abrasion or indentation

The Mohs hardness scale provides a ranking of materials in the order of hardness with a material having a higher Mohs hardness number being able to scratch other materials which have a lower Mohs hardness number

1. From the Mohs scale of hardness, iron which has an harness number of 4.5 can scratch zinc which has an harness number of 2.5, and iron can also scratch aluminum which has an hardness number of 2.5 to 3

2. A penny is made from copper plated material and will have an outer layer hardness of copper which has an hardness number of 3 on the Mohs scale

Therefore, a penny cannot scratch a material mode of nickel which has an hardness number of 4, while iron which has an hardness of 4.5 will scratch a nickel material

(1) Zinc and aluminum can be scratched by an iron nail.

(2) Nickel can be scratched by an iron nail but not a penny.

The hardness of a material is defined as its ability to resist deformation due to mechanical scratching, abrasion, or indentation.

According to the Mohs hardness scale, a material having a higher Mohs hardness number is able to scratch other materials which have a lower Mohs hardness number.

From the Mohs scale of hardness, iron has a hardness number of 4.5, zinc has a hardness number of 2.5, and aluminum which has a hardness number between 2.5 to 3. So, iron can scratch both, Zinc and Aluminium.

A penny is made from copper-plated material copper has a hardness number of 3 on the Mohs scale. Whereas Nickel has a hardness number of 4. Therefore, a penny cannot scratch a material made of Nickel.

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Answer:

hmmdndbdjjdjdhdjejjejdjdhdudududjhdhdhdhd

I hope this helps.......

Answer:

It means that the frequency will be a lot higher with a shorter wave.

Answer:

i know i'm way late. i'm so sorry but the answer is b not c. i just took the test and got 90% this one is wrong. it's B

Explanation:

just took the test.

hope this helps!

have a good day/ night

When a branch is added to a parallel circuit, the total resistance decreases, so the current in the circuit increases.

A parallel circuit is defined as the type of circuit in which the resistors are connected in parallel such that the current flowing through each of them is different.

Here,

The given circuit is connected in parallel combination of resistors. The current has different pathways to flow through. The voltage applied across each resistors will be the same.

Consider a parallel resistance circuit having a combination of n number of resistors with resistance R. The effective resistance of the parallel circuit can be given as,

1/Reff = 1/R₁ + 1/R₂ + 1/R₃ +....1/Rₙ

Since, the resistance is same on all resistors, we can write,

Reff = R/n

So, when adding a branch, the number of resistors, n increases. As a result, the effective resistance of the circuit decreases.

According to Ohm's law, as the resistance of a circuit decreases, the flow of current through the circuit increases.

Hence,

When a branch is added to a parallel circuit, the total resistance decreases, so the current in the circuit increases.

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Answer:

Ex.

1. When we try cycling when we push the padel cycle starts but if we do not push the padels the cycle will stop on one position........

The treatment most likely to use is Superficial External bean Radiation Therapy. Then the correct option is B.

The electromagnetic spectrum consists of the range of all types of EM radiation. Radiation is a packet of energy that travels and spreads out.

It has radio waves, infrared waves, visible light waves, ultraviolet rays, and microwaves.

They possess high energy even to penetrate deep within the material. the electromagnetic spectrum has a longer wavelength and less frequency.

Haley noticed a small spot on her skin that turned out to be skin cancer.

Surgery, radiation, chemotherapy, and hormone therapy can all be used to relieve signs and symptoms.

Medications may relieve symptoms such as pain and shortness of breath. Palliative treatment can be used.

The treatment most likely to use is Superficial External bean Radiation Therapy.

Then the correct option is B.

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Answer:

circuit breakers work in a similar way to fuses, and also protect the circuit from damage if too much current flows but work in a different way. when circuit breakers detect a surge in current in a circuit, they break the circuit by opening a switch. one type of circuit breaker used instead of a fuse and an earth wire is a Residual Current Circuit Breaker (RCCB)

Answer:

Is a tree an example of chemical energy?

Take, for example, an apple tree. The tree absorbs light energy from sunlight, converting the light energy into chemical potential energy stored in chemical bonds. The tree uses this energy to build leaves and branches and fruit. ... Then it takes that heat and converts it into motion, or kinetic energy

Explanation:

Answer:

4.08m

Explanation:

h = PE/mg

h = 600/(15)(9.8)

h = 600/147

h = 4.08m

Answer:

Umm I'm pretty sure is all of the above