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3 years ago

Please help me

Physics

1 answer:

nexus9112 [7]3 years ago

6 0

Answer:

Microwave takes 13.67μs to travel from cell phone to tower

Explanation:

Given data:

Distance traveled by microwave from cell phone to tower = $\frac{4100 m}{3 x 10^{8} m/s}$

We know that the microwave is an electromagnetic wave and the velocity v of electromagnetic wave is 3 x $10^{8}$ m/s.

In general, to determine time of travel from distance and velocity given, we divide distance traveled by velocity. That is

Velocity = $\frac{distance}{time}$

Hence, time = $\frac{distance}{velocity}$

Therefore, time of travel of microwave = $\frac{4100 m}{3 x 10^{8} m/s }$

= $\frac{4100 m}{300 x 10^{6} m/s }$

= 13.67 x $10^{-6}$ s

= 13.67 μs (μs is microseconds)

Hence microwave takes 13.67μs to travel from cell phone to tower.

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How much force is required to accelerate a 57 kg skier 4 m/s2? ______ N (do not write anything except the number)

vfiekz [6]

The amount of force required to accelerate 57kg skier with an acceleration of 4m/s² is 228N.

<h3>How to calculate force?</h3>

Force is a physical quantity that denotes ability to push, pull, twist or accelerate a body and which has a direction and is measured in a unit dimensioned in mass × distance/time².

The force applied on an object can be calculated using the following formula:

Force = mass × acceleration

According to this question, a skier with mass 57kg accelerates at 4m/s². The force required can be calculated as follows:

Force = 57kg × 4m/s²

Force = 228N

Therefore, the amount of force required to accelerate 57kg skier with an acceleration of 4m/s² is 228N.

Learn more about force at: brainly.com/question/1046166

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7 0

2 years ago

A rectangular block weighs 240 N. the area of the block in contact with the floor is 20 cm2.calculate the pressure on the floor(

maks197457 [2]

Answer:

12 N/cm²

Explanation:

From the question given above, the following data were obtained:

Weight (W) of block = 240 N

Area (A) = 20 cm²

Pressure (P) =?

Next, we shall determine the force exerted by the block. This can be obtained as follow:

Weight (W) of block = 240 N

Force (F) =.?

Weight and force has the same unit of measurement. Thus, we force applied is equivalent to the weight of the block. Thus,

Force (F) = Weight (W) of block = 240 N

Force (F) = 240 N

Finally, we shall determine the pressure on the floor as follow:

Force (F) = 240 N

Area (A) = 20 cm²

Pressure (P) =?

P = F/A

P = 240 / 20

P = 12 N/cm²

Therefore, the pressure on the floor is 12 N/cm².

7 0

3 years ago

Help with these three

Elenna [48]

The first: alright, first: you draw the person in the elevator, then draw a red arrow, pointing downwards, beginning from his center of mass. This arrow is representing the gravitational force, Fg.
You can always calculate this right away, if you know his mass, by multiplying his weight in kg by the gravitational constant
$g = 9.81 \frac{m}{s {}^{2} }$
let's do it for this case:
$f_{g} = m \times g \\ f _{g} = 65kg \times 9.81 \frac{m}{s {}^{2} } = 637.65$
the unit of your fg will be in Newton [N]
so, first step solved, Fg is 637.65N
Fg is a field force by the way, and at the same time, the elevator is pushing up on him with 637.65N, so you draw another arrow pointing upwards, ending at the tip of the downwards arrow.
now let's calculate the force of the elevator
$f = m \times a \\ f = 65 \times 5 \frac{m}{s {}^{2} } \\ f = 325n$
so you draw another arrow which is pointing downwards on him, because the elevator is accelating him upwards, making him heavier
the elevator force in this case is a contact force, because it only comes to existence while the two are touching, while Fg is the same everywhere

8 0

3 years ago

The ball is displaced to the left and then oscillates backwards and forwards between the two plates. The ball touches a plate on

ELEN [110]

Answer:

Average current produced by the repeated transfer of charge is 5.6 × 10⁻⁷ ampere

Explanation:

The formula to be used here is

Q = It

where Q is the quantity of electricity and it is measured coulombs (C); 2.8 × 10⁻⁸ C or 0.000000028 C

I is current and it is measured in ampere (amps or A); unknown

t is time and it is measured in seconds (s); 0.05 s

Since, average current is what is unknown

I =Q/t

I = 0.000000028/0.05

I = 5.6 × 10⁻⁷ A

Average current produced by the repeated transfer of charge is 5.6 × 10⁻⁷ ampere

4 0

3 years ago

Please help. Questions are in the image.

yuradex [85]

Speed: measure of how fast an object travels
Velocity: measure of how fast, and in what direction, an object travels
Distance: how far an object has traveled on some path
Position: where an object is located in some reference system
Displacement: the difference between an objects starting position and it’s ending position

8 0

3 years ago