Write down what unit of time, you need to use for measuring

Challenging Questions

a. The beat of your heart.

b. The duration of one period of your class.

c. The time you take to travel from home to school.​

Answers

Answer 1
The answer in my opinion that seems most reasonable is C bc your going to be measuring the distance and time

Related Questions

what is occurring when a light wave goes through a pane of glass in a window?

Answers

Answer:

transmission: the passing of a wave through an object

Explanation:

an open steel can of volume 216 L is filled to the top with gasoline at 13.5 C. when it warms to 36.0 C, how much gas spills over? (don't forget, both the can and the gasoline are expanding.)

Answers

Mass=m=5.61kg∆T=0.124°C=274KHeat=Q=1320J

[tex]\\ \sf\longmapsto Q=mc\Delta T[/tex]

[tex]\\ \sf\longmapsto c=\dfrac{Q}{m\Delta T}[/tex]

[tex]\\ \sf\longmapsto c=\dfrac{1320}{5.61(274)}[/tex]

[tex]\\ \sf\longmapsto c=\dfrac{1320}{1537.14}[/tex]

[tex]\\ \sf\longmapsto c=0.85J/kgK[/tex]

4.44J (creds to commenter on the post, just making it bigger)

A dog walks 100m at a bearing of 175 degrees. a) How far did it walk East?

Answers

1 kilometer

Explanation:

hope it helps

Answer:

275m

Explanation:

hope it helps

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what is physical change​

Answers

Answer:a usually reversible change in the physical properties of a substance, as size or shape:

Freezing a liquid is a physical change.

Explanation:

Rahul is carrying a load of 80 kg along a distance of 200 meters in 5 minutes. But the same load is carried by reena to the same distance in 4 minutes. Who had more power? Also show by calculation .​

Answers

Answer:

Reena

Explanation:

200 / 5 = 40 metres in a minute

200 / 4 = 50 metres in a minute,

Therefore Reena is faster

What is the correct answer and try to explain if can.​

Answers

Answer:

C. Electrical

Explanation:

C because the lamp is plugged into a "Electrical" outlet meaning it uses electrical energy to produce light 'pls can i have brainliest i need it for my goal'

what is the energy of light for a single photon that has a wavelength of 347 nm?

Answers

The energy of light for a single photon that has a wavelength of 347 nm is 5.698 × 10-¹⁹ J

HOW TO CALCULATE ENERGY:

The energy of a photon of light can be calculated by using the following formula:

E = hf

Where;

E = energy of photon (J)h = Planck's constant (6.626 × 10-³⁴J/s)f = frequency (Hz)

However, the frequency must first be calculated using the formula as follows:

λ = v/f

Where;

λ = wavelengthv = speed of light (3 × 10⁸m/s)f = frequency

f = v ÷ λ

f = 3 × 10⁸ ÷ 347 × 10-⁹

f = 3/347 × 10⁸+⁹

f = 0.0086 × 10¹⁷ Hz

f = 8.6 × 10¹⁴ Hz

E = 6.626 × 10-³⁴ × 8.6 × 10¹⁴

E = 56.98 × 10-²⁰

E = 5.698 × 10-¹⁹ J

Therefore, the energy of light for a single photon that has a wavelength of 347 nm is 5.698 × 10-¹⁹ J.

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Which does not take the direction of the motion into account?



Displacement


Distance


velocity

Answers

Velocity and displacement take direction of motion into account while distance does not take direction of motion into account.

Vector quantities take into account both magnitude and direction of motion while scalar quantities only take the magnitude of motion into account. In describing the motion of an object, we use terms such as; velocity, distance, displacement etc.

Looking at the options provided in the question, displacement and velocity are vectors hence they take the direction of motion into account. Distance is a scalar quantity hence it does not take direction of motion into account.

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Mass can be expressed in

Answers

Answer:

mass can be expressed in newtons

Kilograms……………….)….true

Acetylene welding goggles are worn because they protect the eyes from

Answers

Answer:

wala

Explanation:wala

the heat and optical radiation produced by the welding

Please help me to solve this question .​

Answers

Answer:

P1 = momentum before collision = .5 kg * .32 m/s = .16 kg-m/s

Momentum is conserved

P1 = P2 = V * (M + m) = .16 kg-m/sec

V = .16 kg-m/sec / (.5 kg + .3 kg) = .2 m/sec

Can someone help me with these 3 questions!!!

Answers

Answer:

Below

Explanation:

To find the height of a ball thrown upwards we can use this formula :

     vf^2 = vi^2 + 2ad

     0^2 = 22^2 + 2(-9.8)d

     484 = 19.6d

     24.69 = d

     25 m = d

To find the time of the phone dropped we can use this formula :

     t = √2d/g

     t = √2(15) / 9.8

     t = √30/9.8

     t =√3.142857

     t = 1.749

    t = 1.7 seconds

For a) since this object is free falling we know that it will accelerate towards earth at a rate of 9.8 m/s^2. The slope of a velocity time graph gives us the acceleration of the object. So in this case the slope would be 9.8 m.s^2

Hope this helps!

identity the organelle that found in a plant cell but not in an animal cell.
a) cell membrane
b) mitochondria
c) Ribosome
d) chloroplast​

Answers

Answer:

Chloroplast

Explanation:

The plant cell has a cell wall, chloroplasts, plastids, and a central vacuole—structures not found in animal cells. Plant cells do not have lysosomes or centrosomes.

Answer:

d

Explanation:

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have a great day

How much energy will it take to heat a 8kg object with a specific heat capacity of 820J/kg℃ from 15℃ to 50℃

Answers

Explanation:

h=mcƦ

where Ʀ means change in temperature

h=8×820×(50-15)

=8×820×35

=229600j

=229.6kj

in addition to studies of the body system of corals what studies in earth science might increased scientists understanding of an ability to predict coral bleaching

Answers

Answer: they could get a piece of the coral and run tests on it

Explanation:

Paula has walked in a straight line, 30.5° north of west, for 1650 meters. How far south and east should she walks to return to her original location

Answers

The answer is A.
Sy = 1650 x sin30.5 = 837.4 m toward south
Sx = 1650 x cos30.5 = 1421.7 m toward east

what is the equation for newton’s second law of motion, in terms of mass, velocity and time, when the mass of the system is constant?

Answers

Answer:

Newton's second law of motion is F = ma, or force is equal to mass times acceleration.

A 0.80-kg ball is thrown with a velocity of 13 m/s. The ball hit a 0.12-kg bowling pin. When the ball hits the pin, the pin goes flying forward at 6 m/s. What is the velocity of the ball after it hits the pin?

Answers

When the ball of mass 0.80kg hits a bowling pin of 0.12 kg, the velocity of the ball after it hits the pin = 12.1 m/s

The mass of the ball, [tex]m_1=0.80 kg[/tex]

The initial speed of the ball, [tex]u_1=13 m/s[/tex]

The mass of the bowling pin, [tex]m_2=0.12kg[/tex]

The initial speed of the bowling pin, [tex]u_2=0m/s[/tex]

The final speed of the bowling pin, [tex]v_2= 6m/s[/tex]

The final speed of the ball after collision, [tex]v_1 = ?[/tex]

According to the law of momentum conservation

[tex]m_1u_1+m_2u_2=m_1v_1+m_2v_2\\\\0.80(13)+0.12(0)=0.80v_1+0.12(6)\\\\10.4+0=0.8v_1+0.72\\\\0.8v_1=10.4-0.72\\\\0.8v_1=9.68\\\\v_1=\frac{9.68}{0.8} \\\\v_1=12.1m/s[/tex]

The velocity of the ball after it hits the pin = 12.1 m/s

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an empty boat floats in water with 10% of its volume submerged. and when it is loaded with 1200kg , the volume submerged will increase to 70% of the total volume . calculate the mass of the empty boat

Answers

Let volume of empty boat be = 100% = 1V

and mass of boat be M

In water 10%, 0.1V of the volume is submerged.

Mass, m of 1200kg increases the submerging from 10%, 0.1V to 70%, 0.7V

M leads to 0.1V boat submerging

boat submerging.

M + 1200kg leads to 0.7V boat submerging.

This is 60%, 0.6 V increase

By comparison

(M+1200kg) * 0.1V = 0.7V * M

0.1M + 120kg = 0.7M

120kg = 0.7M - 0.1M

120kg = 0.6M

M = (120/0.6)kg

M = 200kg.

The mass of the boat is 200kg.

Two waves travel through ocean, one with wavelength 3 m, one with 6 m. Which one has greater speed?

Answers

Answer: 6m

Explanation: 6 is more than 3 and their both being measured by m

at what speed does a tropical storm become a hurricane

Answers

Answer:

74 mph is the answer

Explanation:

Political polls taken before major elections are examples of ________ research.

Answers

Answer:

survey

Example:

none

An airplane during departure has a constant acceleration of 3 m / s².

a. What is the speed that the plane reaches in 4 s?
b. If the plane passes at a flight point of
at a speed of 20 m / s, what is the speed 8 s later?​

Answers

Constant acceleration of plane = 3m/s²

a) Speed of the plane after 4s

Acceleration = speed/time

3m/s² = speed/4s

S = 12m/s

The speed of the plane after 4s is 12m/s.

b) Flight point will be termed as the point the plane got initial speed, u, 20m/s

Find speed after 8s, v

a = 3m/s²

from,

a = v - u

t

3 = v - 20

8

24 = v - 20

v = 44m/s

After 8s the plane would've 44m/s speed.

Why are some fibers spun together to form yarns?

Answers

Answer:

Spun yarns are produced by placing a series of individual fibres or filaments together to form a continuous assembly of overlapping fibres, usually bound together by twist. This operation is required in wool spinning because different parts of the fleece contain fibres of different length and thickness.

A projectile is launched horizontally from a height of 25m and it is observed to land 50m from the base. What was the launch velocity?

Answers

The initial horizontal velocity of the projectile is 22.1 m/s.

The given parameters;

height of the projectile, h = 25 mhorizontal distance of the object, R = 50 m

The time of motion of the object is calculated as follows;

h = ut + ¹/₂gt²

where;

u is the initial vertical velocity = 0

h = ¹/₂gt²

[tex]t = \sqrt{\frac{2h}{g} } \\\\t = \sqrt{\frac{2\times 25}{9.8} } \\\\t = 2.26 \ s[/tex]

The initial horizontal velocity of the projectile is calculated as follows;

R = vₓt

[tex]v_x = \frac{R}{t} \\\\v_x = \frac{50}{2.26} \\\\v_x = 22.1 \ m/s[/tex]

Thus, the initial horizontal velocity of the projectile is 22.1 m/s.

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1.concave lens
A.distance between two waves
B.can be captured on screen
C.light of a wavelength
D.scattered incident light
E.convex lenses
F. distance to the focal point
G.light swinging in one direction
H.heat radiation ​

Answers

What to do here tell please.......

What do you think will happen to current if we increase or decrease the resistance of the connecting wire?​

Answers

Answer:

If resistance is increased, the current decreases and if the resistance is decreased, the current flowing through the wire increases.

Explanation:

V = IR is ohm's law which implies I = V/R, where I is the current and V is the voltage and R is the resistance. Hence, I is inversely proportional to R.

Two motorcycles travel along a straight road heading due north. At t = 0 motorcycle 1 is at x = 50 m and moves with a constant speed of 6.50 m/s; motorcycle 2 starts from rest at x = 0 and moves with constant acceleration. Motorcycle 2 passes motorcycle 1 at the time t = 10.08.

Part B What is the position of the two motorcycles when motorcycle 2 passes motorcycle 1? Express your answer to three significant figures and include the appropriate units.

Part C What is the acceleration of motorcycle 2? Express your answer to three significant figures and include the appropriate units.​

Answers

Answer:

Vf = 23 m/s

Explanation:

First we need to find the distance covered by the motorcycle 2 when it passes motorcycle 1. Using the uniform speed equation for motorcycle 1:

s₁ = v₁t₁

where,

s₁ = distance covered by motorcycle 1 = ?

v₁ = speed of motorcycle 1 = 6.5 m/s

t₁ = time = 10 s

Therefore,

s₁ = (6.5 m/s)(10 s)

s₁ = 65 m

Now, for the distance covered by motorcycle 2 at the meeting point. Since, the motorcycle started 50 m ahead of motorcycle 2. Therefore,

s₂ = s₁ + 50 m

s₂ = 65 m + 50 m

s₂ = 115 m

Now, using second equation of motion for motorcycle 2:

s₂ = Vi t + (1/2)at²

where,

Vi = initial velocity of motorcycle 2 = 0 m/s

Therefore,

115 m = (0 m/s)(10 s) + (1/2)(a)(10 s)²

a = 230 m/100 s²

a = 2.3 m/s²

Now, using 1st equation of motion:

Vf = Vi + at

Vf = 0 m/s + (2.3 m/s²)(10 s)

Vf = 23 m/s

WHAT IS THE VOLUME OF A 5.71 G PLASTIC CUBE THAT HAS A DENSITY OF 1.15 G/CM3

Answers

Answer:4.96[tex]cm^{3}[/tex]

Explanation: Density is [tex]\frac{Mass}{Volume}[/tex]

so you are now looking for volume.

Volume= Density x Mass so

Volume = (5.78g) x(1.15g/ [tex]cm^{3} \frac{x}{y}[/tex]) =4.96[tex]cm^{3}[/tex]

What are two factors that must be kept the same (constant) between both groups?
Must be given 30 mL of water for 7 days.
c. What is the independent variable?
d. What is the dependent variable?
e. Which is the experimental group?
f. Which is the control group?
g. What must be done to make this experiment valid?

Answers

Answer:

Which is the control group?

g. What must be done to make this experiment valid?

Explanation:

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