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3 years ago

Jeremy walked at an average rate of speed of 5 km/h. how far had Jeremy walked in 15 minutes?

Physics

2 answers:

astraxan [27]3 years ago

5 0

Answer:

1 half kilometer is right answer

Luda [366]3 years ago

5 0

Well if we know he can walk 5km in one hour (or 60 minutes) we can do ratios,,,

Km : minutes
5 : 60
: 15

We can do 5 divided by 60 multiplied by 15 to get the unknown km

This will give us 5/4 or 1.25

So he can walk 1.25 km in 15 minutes.

Hope this helps! Any questions let me know :)

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Help!!! I need it today <br> Thank you in advance

svlad2 [7]

Answer:

F = - k (x-xo) a graph of the weight or applied force against the elongation obtaining a line already proves Hooke's law.

Explanation:

The student wants to prove hooke's law which has the form

F = - k (x-xo)

To do this we hang the spring in a vertical position and mark the equilibrium position on a tape measure, to simplify the calculations we can make this point zero by placing our reference system in this position.

Now for a series of known masses let's get them one by one and measure the spring elongation, building a table of weight vs elongation,

we must be careful when hanging the weights so as not to create oscillations in the spring

we look for the mass of each weight

W = mg

m = W / g

and we write them in a new column, we make a graph of the weight or applied force against the elongation and it should give a straight line; the slope of this line is sought, which is the spring constant.

The fact of obtaining a line already proves Hooke's law.

5 0

3 years ago

What is the magnitude of the electric field at the point (8.70 - 9.10 7.20 ) m if the electric potential is given by V

frez [133]

This question is incomplete, the complete question is;

What is the magnitude of the electric field at the point (8.70i - 9.10j + 7.20k ) m if the electric potential is given by V = 4.30xyz², where V is in volts and x, y and z are in meters.

Answer:

the magnitude of the electric field is 5648.67 N/C

Explanation:

Given the data in the question;

Suppose electric field at this point is;

E = Exi + Eyj + Ezk

Now, electric field is given by;

E = -dV/dr

so,

Ex = -d( 4.30xyz² )/dx = -4.30yz²

Ey = -d( 4.30xyz² )/dy = -4.30xz²

Ez = -d( 4.30xyz² )/dz = -8.60xyz

E = -4.30yz² i - 4.30xz² j - 8.60xyz k

now, at the point (8.70i - 9.10j + 7.20k )

E = (-4.30(-9.10)(7.20)²) i + (-4.30(8.70)(7.20)²) j + (-8.60(8.70)(-9.10)(7.20) k

E = 2028.499 i - 1939.334 j + 4902.206 k

so, Magnitude of electric field will be;

|E| = √( Ex² + Ey² + Ez² )

we substitute

|E| = √( (2028.499)² + (-1939.334)² + (4902.206)² )

|E| = √( 31907448.222993 )

|E| = 5648.67 N/C

Therefore, the magnitude of the electric field is 5648.67 N/C

5 0

3 years ago

A thin layer of oil of refractive index 1.30 is spread on the surface of water (n = 1.33). If the thickness of the oil is 210 nm

lakkis [162]

Answer:

546 nm

Explanation:

$n_{oil}$ = Index of refraction of oil = 1.30

$n_{water}$ = Index of refraction of water = 1.33

$t$ = thickness of the oil = 210 nm = 210 x 10⁻⁹ m

$\lambda$ = wavelength of light = ?

$m$ = order = 1

For reflection , the necessary condition is

$2 n_{oil} t = m \lambda$

$2 (1.30)(210\times 10^{-9})= (1) \lambda$

$\lambda = 5.46\times 10^{-7}$

$\lambda = 546$ nm

4 0

3 years ago

A bicyclist of mass 88.0 kg puts all his weight on each downward-moving pedal as he pedals up a steep road. Take the diameter of

Eduardwww [97]

Answer:

142.296 Nm.

Explanation:

Torque: This is the force that tend to cause a body to rotate or twist. The S.I unit of torque is Nm.

From the question,

T = F×r.................... Equation 1

Where T = Torque, F = Force, r = radius of the circle.

Note: F is the weight of the bicyclist.

Then,

F = W = mg............... Equation 2

Substitute equation 2 into equation 1

T = mgr................... Equation 3

Given: m = 88 kg, g = 9.8 m/s², r = 0.33/2 m

T = 88(9.8)(0.33)/2

T = 142.296 Nm.

3 0

3 years ago

The purpose of technology is to solve problems and meet needs. True False

BARSIC [14]

The above given sentence is true reason being the use of Technology.

Explanation:

The basic purpose double technology is to make hard work easier and help in meeting the needs. Technology was being developed and is being upgraded so as to make some of the tasks, which were harder to do without it, easier.

Development of Technology has made the work easier and the needs are being met with an additional profit of saving time.

4 0

3 years ago