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USPshnik [31]
3 years ago
9

A change in position of an object relating to time

Physics
2 answers:
Stella [2.4K]3 years ago
8 0

Answer:

Speed describes how far an object moves in a given amount of time (for example, miles per hour).

Explanation:

MaRussiya [10]3 years ago
3 0
The answer is: Motion!

Have a great day
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Which unit would you use to express the height of your desk?
swat32
Height is the length by nature so i'll use meter to express it!
8 0
3 years ago
Consider a step-down transformer with 15 turns in the primary and 6 turns in the secondary windings. Calculate the input impedan
AURORKA [14]

Answer:

Input impedance of this transformer is 50 ohms.  

Explanation:

Given that,

Number of turns in the primary coil, N_p=15

Number of turns in the secondary coil, N_s=6

Output impedance of the transformer, V_o=8\ \Omega

The number of turns and the impedance ratio in the step down transformer is given by :

\dfrac{15}{6}=\sqrt{\dfrac{Z_p}{Z_s}}\\\\\dfrac{15}{6}=\sqrt{\dfrac{Z_p}{8}}\\\\Z_p=50\ \Omega

So, the input impedance of this transformer is 50 ohms. Hence, this is the required solution.

8 0
3 years ago
Find a numerical value for ρearth, the average density of the earth in kilograms per cubic meter. use 6378km for the radius of t
Andre45 [30]

Answer:

5501 kg/m^3

Explanation:

The value of g at the Earth's surface is

g=\frac{GM}{R^2}=9.70 m/s^2

where G is the gravitational constant

M is the Earth's mass

R=6378km = 6.378 \cdot 10^6 m is the Earth's radius

Solving the formula for M, we find the value of the Earth's mass:

M=\frac{gR^2}{G}=\frac{(9.81 m/s^2)(6.378\cdot 10^6 m)^2}{6.67\cdot 10^{-11}}=5.98\cdot 10^{24}kg

The Earth's volume is (approximating the Earth to a perfect sphere)

V=\frac{4}{3}\pi r^3 = \frac{4}{3}\pi (6.378\cdot 10^6 m)^3=1.087\cdot 10^{21} m^3

So, the average density of the Earth is

\rho = \frac{M}{V}=\frac{5.98\cdot 10^{24} kg}{1.087\cdot 10^{21} m^3}=5501 kg/m^3

4 0
3 years ago
Read 2 more answers
You are riding a bicycle. You apply a forward force of 150 N, and you and the bicycle have a combined mass of 90 kg. What is the
Ymorist [56]

<u>Answer</u>

1.667 m/s²

Using the Newton's second law of motion;

force is directly proportional to the rate of change of momentum and it takes place in the direction of force.

i.e F = change in momentum

F = (mv - mu)/t

   =m(v-u)/t

   = ma

∴ F =ma

  a = F/m

      = 150/90

      = 1.667 m/s²

4 0
3 years ago
How far can a person travel in 19 minutes, walking at a speed of 5.0 km/h ?​
anyanavicka [17]

Answer:

5.0 km/h = 5.0 km/60min

speed = distance/time

distance = speed x time = 5.0km/60min x 19min = 1.6km

Explanation:

4 0
3 years ago
Read 2 more answers
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