A cyclist moves a distance of 30 m from points A to B in a straught line towards East with a speed of 10 m/s. He then moves a distance of 40 m from points B to C in a straight line towards North with a speed of 20 m/s. Calculate the cyclist's (1) Average Speed, (2) Average Velocity, for the whole journey

Answer:

1.   2.5km

2.  4.8m

3. 0.075 litre

4.  65000mg

5.  5600g

6. 0.5m

7. 63mm

Explanation:

1. 1000m in 1 km so divide by 1000

2. 100cm in m so divide by 100

3. 1000ml in 1l   so divide by 1000

4. multiply the mass value by 1000

5.multiply the mass value by 1000

6. divide the length value by 100

7. multiply the length value by 10

hope this helps

Answer: Second choice (straight down arrow)

Explanation:

I just did it.

Disregarding air resistance, the diagram showing the free-body diagram of the force or forces acting on the apple is second one.

When an object is released from rest in free air considering no friction, the motion is depend only on the acceleration due to gravity, g.

Given is an apple is falling from a tree.

When apple is falling down, the gravity will attract the apple towards the center of the Earth. Air resistance is not considered, otherwise it would be acting upwards.

Normal force will not act as apple in not placed on any kind of surface.

So, the only force acting is force of gravity also called as weight of apple.

Thus, the free-body diagram of the force or forces acting on the apple is second one.

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Answer:

The word physics originates from Greek word meaning nature physics is therefore a science dealing with the study of nature and various natural phenomenon.Physcis is the branch of science which deals with the study of matter,energy and the relationship between them.

Science is derived from the Greek word scientia which means knowledge science is defined as the knowledge gathered from observations and experimentations.

Explanation:

Hope it will help you. :)

Answer:

0.69 g/cm^3

Explanation:

Given that a small beaker has 50 mL of water in it. A small frog with a mass of 20 grams is dropped into the beaker. The water level rises to 79mL.

The volume of the frog will be:

79 - 50 = 29mL

Convert it to litre by dividing it by 1000

29/1000 = 0.029 L

Since 1L = 1000 cm^3

Convert it to cm^3 by multiplying it by 1000

0.029 × 1000 = 29 cm^3

Density = mass/volume

Substitute the mass and volume into the formula

Density = 20/29

Density = 0.6896 g/cm3

Therefore, the density of the frog is 0.69 g/cm^3 approximately

Answer:

Aluminium, Nickel, Cobalt and Iron plus varying levels of Copper, Titanium and Niobium.

MAGNETIC: Alni, Alcomax, Hycomax, Columax, and Ticonal.

Answer:

Mass=3,time=15,height=50,g=10,Power=?.

Power=mgh/t.....3×10×15=1500/15=100Watts.

Answer:

[tex]\huge \boxed{\mathrm{100 \ Watts}}[/tex]

Explanation:

[tex]\sf \displaystyle P=\frac{mgh }{t} \\\\\\ P=power \ (W) \\\\ m=mass \ (kg) \\\\ g=gravity \ acceleration \ (m/s^2) \\\\ h=height \ (m) \\\\ t=time \ taken \ (s)[/tex]

[tex]\sf \displaystyle P=\frac{3 \times 10 \times 50 }{15}[/tex]

[tex]\sf \displaystyle P=\frac{1500 }{15}[/tex]

[tex]\sf \displaystyle P=100[/tex]

Given : We have given sets of speed 5.0 m/s, -10.0 m/s, 520.0 cm/s, 18.0 cm/s ,2.0 cm/s .

To Find : Order the given speed from fastest to lowest .

Solution :

First of all we have to convert all the given speed in same units .

We know , 1 m = 100 cm .

Therefore , speed in units cm/s is :

500 cm/s , -1000 cm/s , 520 cm/s , 18 cm/s , 2 cm/s .

We know , that -ve and +ve sign only indicates the direction .

So , comparing their magnitude , we get the order as :

-1000 cm/s , 520 cm/s , 500 cm/s , 18 cm/s , 2 cm/s .

Hence , this is the required solution .

Answer:

Well, their are two answers in their. It would be Ask their Parent for assistance in persuading and Ask for an opportunity to earn extra credit:)

Explanation:

To improve feelings about a poor test result, a student should ask for an opportunity to earn extra credits. Hence, option D is correct.

Remember that you are so much more valuable than a letter on a piece of paper. Your attitude, personality, and experience are things that future employers, coworkers, teachers, friends, and family are interested in. Even while practicing excellent self-care is always important, having a program in place will help you deal with any anxiety you may be experiencing in the future.

Start with the fundamentals, like eating healthily, Getting your five a day is a fantastic place to start Since it provides your body and brain with all the nutrition they require, and it can help you deal with any cortisol increases (stress). Additionally, ensure you get at least eight hours of sleep each night and consume six to eight glasses of water each.

To improve feelings about a poor test result, a student should ask for an opportunity to earn extra credits. Hence, option D is correct.

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Answer:

B

Explanation:

heating increases the temperature, increase in temperature increases number of collisions hence increases pressure,volume still remains because there is no addition

Heating increases the temperature, increase in temperature increases the number of collisions hence increasing pressure, volume still remains because there is no addition

The answer is option B.

Due to the fact the frequency of collisions depends on the temperature, A is virtually now not steady. Instead, A will increase slightly with temperature as the extended kinetic energy of molecules at higher temperatures reasons them to move barely faster and for that reason go through more collisions consistent with unit time.

The extent of the fuel consequently turns large because the temperature of the fuel will increase. As the number of gas particles increases, the frequency of collisions with the partitions of the box ought to grow.

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Answer:

The pulling force F is 200 N

Explanation:

We note that the tension in a rope between two or three blocks is given by the relation;

Where we have;

m₁ → T₁ → m₂ → T₂ → m₃ → F

[tex]T_1 = \dfrac{m_1}{m_1 + m_2 + m_3} \times F[/tex]

[tex]T_2 = \dfrac{m_1 + m_2}{m_1 + m_2 + m_3} \times F[/tex]

m₁ = 2 kg

m₂ = 4 kg

m₃ = 4 kg

T₂ = 120 N

Therefore, by substitution, gives;

2 kg → T₁ → 4 kg → 120 N → 4 kg → F

[tex]120 \ N = \dfrac{2 \ kg + 4 \ kg}{2 \ kg+ 4 \ kg+ 4 \ kg} \times F = \dfrac{6 \ kg}{10 \ kg} \times F[/tex]

F = 120 N × (10 kg)/(6 kg) = 200 N

The pulling force F = 200 N.

Answer:

Camilla

Explanation:

Answer:Camilla        

Explanation:

Answer:

Inertia.

Explanation:

You are moving with a speed of 1 m/s. You are carrying a tray and the ball is at rest in the tray. You stops and the ball rolls off the tray. Whenever you starts moving with a speed of 1 m/s and when ball is at rest, due to inertia of motion the ball comes in motion. But when you stops, the ball is still in motion due to its inertia.

Hence, due to inertia the ball roll off the tray.

Answer:

because you are taking longer and faster strides

Explanation:

Answer:

you are taking longer to skip.

Explanation:

Answer:

Human-driven changes in arrive utilize and arrive cover such as deforestation, urbanization, and shifts in vegetation designs moreover change the climate, coming about in changes to the reflectivity of the Soil surface (albedo), emanations from burning timberlands, urban warm island impacts and changes within the normal water cycle.

Answer:

KINETIC ENERGY=K.E=0.00245 Joules ≈ 0.003 Joules

Explanation:

mass=m=0.1g=0.0001kg

velocity=v=7.0m/s

kinetic energy=K.E.=?

as we know that

[tex]kinetic energy=\frac{1}{2}mv^2\\ putting values\\kinetic energy=\frac{1}{2}(0.0001kg)(7.0m/s)^2\\ kinetic energy=\frac{1}{2} 0.0049joules\\kinetic energy= 0.00245Newton meter or joules[/tex]

hope it will help ^_^

Answer:

a) y = 103.21 m

b) t = 4.6 s

Explanation:

a) The height at which the balls was is given by:

[tex] V_{f}^{2} = V_{0}^{2} - 2g(y_{f} - y_{0}) [/tex]

Where:

[tex]y_{f}[/tex]: is the final height = 0

[tex]y_{0}[/tex]: is the initial height =?

[tex]V_{f}[/tex]: is the final velocity = 45 m/s

[tex]V_{0}[/tex]: is the initial velocity = 0 (is held at rest

g: is the gravity = 9.81 m/s²          

Hence, the height is:

[tex] y_{0} = \frac{V_{f}^{2}}{2g} = \frac{(45 m/s)^{2}}{2*9.81 m/s^{2}} = 103.21 m [/tex]

b) The time before the ball hit the ground is:

[tex] V_{f} = V_{0} - g*t [/tex]

[tex] t = -\frac{V_{f}}{g} = -\frac{- 45 m/s}{9.81 m/s^{2}} = 4.6 s [/tex]

Therefore, 4.6 seconds passed before the ball hit the ground.

I hope it helps you!  

Answer:

0.72 atm

Explanation:

Given that the atmospheric pressure on a mountain is 550 mmHg.

Where 1 atm is equal to 760 mmHg.

To Convert millimetre mercury (mmHg) into atmospheric pressure units (atm) , divide the magnitude of pressure by 760. That is,

Pressure = 550/760

Pressure = 0.724 atm

Therefore, pressure in atm is 0.72 atm in two significant figures

Answer:

80 kmh

Explanation:

IDK lol i just divided it by 2 because he drove 80 kilometres in one hour

Answer:

80kmph

Explanation:

speed = d/t

d= distance

t= time

s=160/2

s=80kmph

Answer:

80.08 km/h

Explanation:

Given that Black Panther ran 567.6 km to the east in 23 hours

Velocity = distance covered/time

Substitute the distance covered and time into the formula

Velocity = 567.6/23

Velocity = 24.68 km/h

then turned around and ran 221.8 km to the west in 1.2 hours.

Velocity = 221.8/1.2

Velocity = 184.83 km/h

What was his average velocity during the trip in km/h ?

Average velocity = (V + U)/2

Since the two velocity are opposite to each other, the average velocity will be:

Average velocity = (-24.68 + 184.83)/2

Average velocity = 160.15/2

Average velocity = 80.08 km/h

Therefore, his average velocity during the trip is 80.08 km/h

Answer:

[tex] \boxed{ \bold{ \boxed{ \sf{see \: below}}}}[/tex]

Explanation:

MA ( Mechanical Advantage ) is always less than VR ( Velocity Ratio ) because MA is reduced by friction but VR is not affected by friction.

Hope I helped!

Best regards! :D

Answer:

2.1 m/s

Explanation:

The following data were obtained from the question:

Initial velocity (u) = 7 m/s

Time (t) = 0.50 s

Final velocity (v) =?

Since the is thrown upward, it means that the stone is going against gravity. Thus, the value of the acceleration due to gravity will be negative i.e – 9.8 m/s²

Thus, we can obtain the velocity of the stone after 0.50 s as follow:

Initial velocity (u) = 7 m/s

Time (t) = 0.50 s

Acceleration due to gravity (g) = – 9.8 m/s²

Final velocity (v) =?

v = u + gt

v = 7 + (– 9.8 × 0.5)

v = 7 – 4.9

v = 2.1 m/s

Therefore the velocity of the stone after 0.5 s is 2.1 m/s.

Answer:

The brain moves inside the skull with a force equal and opposite to that of the impact.

Explanation:

Answer:

870kg = 1,917.48 lbs

Explanation:

1 kilogram = 2.204 pounds

pounds = 870(2.204)

pounds = 1,917.48

I hope this helps!

-TheBusinessMan

Answer:

1918.35

Explanation:

multiply the value to mass... which is 2.205

so 870×2.205=1918.35

Explanation:

Acceleration is change in velocity over change in time.

a = Δv / Δt

a = (-6.8 m/s − (-3.0 m/s)) / (33 min × 60 s/min)

a = (-3.8 m/s) / (1980 s)

a = -0.0019 m/s²

Answer:

electric field must not exceed 5000 V / m  ( 5 kV/m)

Explanation:

All electrical equipment produces electric and magnetic fields that must be within the range recommended by WHO, the upper limit for the sum of all fields is

  The electric field must not exceed 5000 V / m

to get an idea of ​​the intensity produced by one of the devices that has the largest electric field in the radio with 180 V / m

Answer

The magnitude of the electric force on the electron is 480 x 10⁻¹⁹ N .

|F-->1| =  E-->1 x charge on proton

= 300 x 1.6 x 10⁻¹⁹

Magnitude of the electric force on proton

|F-->1| = 480 x 10⁻¹⁹ N .

Inside the lithium nucleus , there are three protons so charge on it

= 3 x 1.6 x 10⁻¹⁹

= 4.8 x 10⁻¹⁹ C .

The magnitude of electric force on lithium nucleus

|F-->Li|  =   E-->1 x charge on lithium nucleus

= 300 x  4.8 x 10⁻¹⁹

= 1440 x 10⁻¹⁹ N .

Electron has same charge as that possessed by proton so charge on electron = 1.6 x 10⁻¹⁹ C

Magnitude of force on electron

|F-->1| =  E-->1 x charge on electron

= 300 x 1.6 x 10⁻¹⁹

=  480 x 10⁻¹⁹ N .

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Complete question

A proton at location A makes an electricfield E-->1 atlocation B. A different proton, placed atlocation B, experiences a force F--->1.

If |E-->|= 300 N/C, what is |F-->1|?

|F-->1|= N

Now the proton at B is removed and replaced by alithium nucleus, containing three protons and four neutrons. Theproton at location A remains in place.

What is the magnitude of the electric force on the lithium nucleus?

|F-->Li| = N

Now the Lithium nucleus is removed, and an electron is placed atlocation B. The proton atlocation A remains in place. What is the magnitude of the electric force on the electron?

Explanation:

moment is an expression involving the product of a distance and physical quantities.

-the size of force applied.

-the perpendicular distance from the pivot to the line of action of the force