a car travels 50km east east in 30 min what is its velocity in km/h

Answer:

 d_total = 12 m

Explanation:

This is a kinematics problem, in the attachment we can see the problem graph, they ask us how much the distance is worth for all the time of 24 s.

The total distance is

            d_total = d₁ + d₂ + d₃

as in the graph the part of d₂ is horizontal (v=0) the distance is zero d₂ = 0

the distance d₁ is

         d₁ = 12 -6 = 6 m

the distance d₃

         d₃ = 6 -0 = 6 m

therefore the total distance traveled is

         d_total = 6 + 0 + 6

         d_total = 12 m

Answer: 3,602.4 km

Explanation:

Ok, the distance between the sun and the nearest star is 4.22 light-years.

1 light-year = 9.461x10^12 km

4.22 light-years. = 4.4*(9.461x10^12 km) = 41.6284x10^12km.

Now, the radius of the Sun is:

r1 = 693,340 km

The radius of the grapefruit is around:

r2 = 6cm

Then in this new scale, 6 centimeters are equivalent to  693,340 km.

Now, how many times there are 693,340 km in 41.6284x10^12km?

We can take the quotient:

N = (41.6284x10^12km/ 693,340 km)  = 60,040,384.

Then, the distance between the sun-grapefuit and the nearest star will be  60,040,384 times 6 centimeters:

Distance = 60,040,384*6cm = 360,242,304 cm ≈ 3,602.4 km

Answer:

The force the man applied is 80 N

Explanation:

weight of the load, L = 800 N

distance traveled by the load, a = 10 m

distance traveled by the effort, b = 100 m

Output work = load x distance moved by the load

Output work = 800 x 10 = 8000 J

Input work = Effort x distance moved by effort

Input work = Effort x 100 m

Assuming an ideal machine; no friction effect, the input work will be equal to output work.

Effort x 100 m = 8000 J

Effort = 8000 / 100

Effort = 80 N

Therefore, the force the man applied is 80 N

Answer:

33.6 m

Explanation:

Given:

v₀ = 0 m/s

a = 47.41 m/s²

t = 1.19 s

Find: Δx

Δx = v₀ t + ½ at²

Δx = (0 m/s) (1.19 s) + ½ (47.41 m/s²) (1.19 s)²

Δx = 33.6 m

Answer:

[tex] \boxed{\sf Efficiency \ of \ the \ motor = 62.5 \ \%} [/tex]

Given:

Input Power ([tex] \sf P_i [/tex])= 1000 W

Mass (m) = 100 kg

Height (h) = 10 m

Time (t) = 16 s

To Find:

Efficiency of the motor

Explanation:

[tex] \boxed{ \bold{Output \: power \: (P_o)= \frac{mgh}{t}}}[/tex]

[tex] \sf \implies P_o = \frac{100 \times 10 \times 10}{16} [/tex]

[tex] \sf \implies P_o = \frac{10000}{16} [/tex]

[tex] \sf \implies P_o = \frac{ \cancel{16} \times 625}{ \cancel{16}} [/tex]

[tex] \sf \implies P_o = 625 \: W[/tex]

[tex] \boxed{ \bold{Efficiency = \frac{Output \ Power \ (P_o)}{Input \ Power \ (P_i) } \times 100}}[/tex]

[tex]\sf \implies Efficiency = \frac{625}{10 \cancel{00}} \times \cancel{100}[/tex]

[tex]\sf \implies Efficiency = \frac{625}{10} [/tex]

[tex]\sf \implies Efficiency = 62.5 \: \%[/tex]

[tex] \therefore[/tex]

Efficiency of the motor = 62.5 %

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:

The yo-yo :)

Explanation:

Answer:

4.775,94

Explanation:

FORMULA:

[tex]\frac{1}{3} * 3,14 * Rx^{2} * H[/tex]

one-third per "pi" (3.14), per radius squared, per height.

Answer:

vol = 4778.36 cm³

Explanation:

volume of a cone = 1/3 π r² h

height (h) = 27 cm

radius (r) = 13 cm

plug in values:

vol = 1/3 π (13)² 27

vol = 4778.36 cm³

Answer:

B. commutator

Explanation:

The DC motor has a commutator, to keep the rotor rotating. The rotor of the DC motor usually  stop spinning once it aligns with the magnetic field. However, the commutator  would reverse the current through the stator and in this process reverse the magnetic field. This ensures continuous spinning of the rotor.

Therefore, the correct option is "B. commutator."

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?

Answer:

The tennis ball ended 8 m north from the starting point.

Explanation:

If we label North as positive and south as negative for axis of reference, then the tennis ball performed the following displacements (in units of meters):

- 22 m + 12 m - 16 m + 34 m = 8 m

Which means that it ended 8 m north from the starting point.

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.

Learn more about free falling.

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Answer:

80metre

Explanation:

1m=10decimetre,100 cm

80 meters

1 m = 10 dm

716 dm = 716 : 0,1 m = 71, 6 m

1 m = 100 cm

840 cm = 840 : 0,01 m = 8, 4 m

716 dm + 840 cm =

= 71,6 m + 8,4 m

= 80 meters

Answer:

m1u1+m2u2=(m1+m2)v.

500×4+1500×2=(500+1500)V.

2000+3000=2000V.

5000=2000V.

V=2.5m/s

Answer:A

Explanation: it’s A

Answer:

B = B (cos θ  x ^ + sin θ  y ^)

Explanation:

To represent the magnetic field B using unit vectors, the magnitude of the field and the angle with respect to some coordinate axis must be known. Having this information, trigonometry can be used.

Suppose that the angle we have is with respect to the positive side of the x-axis, let's use trigonometry

             cos θ = Bₓ / B

             sin θ = [tex]B_{y}[/tex] / B

             Bx = B cos θ

             B_{y} = B sin θ

so the resulting vector is

             B = Bₓ i ^ + B_{y} j ^

unit vectors

             x ^ = i ^

             y ^ = j ^

let's write the complete answer

          B = B (cos θ  x ^ + sin θ  y ^)

The bold indicate vector

1.2 km × 1000 = 1200m

1200m : 15 = 80s

so it will take 80 seconds or 1 minute 20seconds.

Answer:

3m/s

Explanation:

Time=5s

Distance =15m

Speed=distance/time

Putting the values

Speed=15m/5s

Speed=3m/s is the answer

Hope it will help you. :)

Answer:

2. By vibrations in wires or strings.

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

Answer:

KE= 900joules, product= 60kgm/s momentum

Explanation:

KE=1/2MV2= 1/2× 2×30×30=900J

PRODUCT= MOMENTUM= 30m/s×2kg= 60kgm/s

Explanation:

Hey, there!

The liquid pressure varies with depth because liquid pressure is directly proportional to the depth of liquid from the free surface of the liquid. so, more the depth more the pressure and less the depth less the pressure.

Hope it helps...

Answer: 75.02 m

Explanation:

u = 0 ( starts from rest )

v = 50 m/s

t = 3 s

( i ) a = v - u / t

= 50 - 0 /3

= 16.67

( ii ) s = ut + 1/2 at²

= 0 × 3 + 1/2 × 16.67 × 3 × 3

= 75.02 m

Hope this helps...

Answer:

When air is flushed into the ball, the elastic lining inside is expanded. This happens because when too much air enters, there is a lacking of space inside. Therefore the air with pressure pushes the walls of the ball and results in inflation.(same like after you have excess food your stomach inflates)

Answer:

An ammeter should be connected in the series while the voltmeter in parallel.

Explanation:

Ammeter is the device used to measure the electric current. So , the total current flowing through the circuit must pass through the ammeter. Thus , it should be connected in series. While voltmeter is a device used to measure the potential difference between two ends. Therefore, voltmeter should be connected in parallel to measure the potential difference across two ends.

Answer:

C 3.3 s

Explanation:

Given:

Δy = 9 m

v₀ = 0 m/s

a = ⅙ (9.8 m/s²) = 1.63 m/s²

Find: t

Δy = v₀ t + ½ at²

9 m = (0 m/s) t + ½ (1.63 m/s²) t²

t = 3.3 s