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3 years ago

4. A moped travels 20 kilometers in 30 minutes. Calculate its average speed in km/h?

Physics

2 answers:

Nikolay [14]3 years ago

7 0

Average speed = 40km/h

Ann [662]3 years ago

5 0

Answer:

$\boxed{Average \: speed = 40 km/h}$

Explanation:

Distance travelled = 20 km

Time taken = 30 min

= $\frac{30}{60}$ h

= $\frac{1}{2}$ h

$Average \: speed = \frac{Distance \: travelled}{Time \: taken} \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{20}{ \frac{1}{2} } \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 20 \div \frac{1}{2} \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 20 \times 2 \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 40km/h$

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8. Express 2.69 x 10^9 in standard form.

taurus [48]

Answer:

242.1

Explanation:

10 x 9 equals 90

2.69 x 90 = 242.1

5 0

2 years ago

Find the 24th term of the arithmetic sequence 11, 14, 17, … . Express the 24 terms of the series of this sequence using sigma no

Anna71 [15]

Answer:

The 24th term is 80 and the sum of 24 terms is 1092.

Explanation:

Given that,

The arithmetic series is

11,14,17,........24

First term a = 11

Difference d = 14-11=3

We need to calculate the 24th term of the arithmetic sequence

Using formula of number of terms

$t_{n}=a+(n-1)d$

Put the value into the formula

$t_{24}=11+(24-1)\times3$

$t_{24}=80$

$t_{24}=u_{24}=80$

We need to calculate the sum of the first 24 terms of the series

Using formula of sum,

$S_{n}=\dfrac{n}{2}(a+u_{24})$

Put the value into the formula

$S_{n}=\dfrac{24}{2}\times(11+80)$

$S_{n}=1092$

Hence, The 24th term is 80 and the sum of 24 terms is 1092.

5 0

3 years ago

The diameter of 0-gauge copper wire is 8.252 mm. Find the resistance of a 1.00-km length of such wire used for power transmissio

Dafna1 [17]

Answer:

The value is $R = 0.321 \ \Omega$

Explanation:

From the question we are told that

The diameter is $d = 8.252 \ mm = 0.008252 \ m$

The length of the wire is $l = 1.0 \ km = 1000 \ m$

Generally the cross sectional area of the copper wire is mathematically represented as

$A = \pi * \frac{d^2}{4}$

=> $A = 3.142 * \frac{ 0.008252^2}{4}$

=> $A = 5.349 *10^{ - 5} \ m^2$

Generally the resistance is mathematically represented as

$R = \frac{\rho * l }{A }$

Here $\rho$ is the resistivity of copper with the value $\rho = 1.72*10^{-8} \ \Omega \cdot m$

=> $R = \frac{1.72 *10^{-8} * 1000 }{5.349 *10^{ - 5} }$

=> $R = 0.321 \ \Omega$

5 0

2 years ago

Starting from the front door of your ranch house, you walk 50.0m due east to your windmill, and then you turn around and slowly

juin [17]

Answer:

velocity = 0.3m/s

speed = 1.21 m/s

Explanation:

The total time it takes to get from the front door to the bench is

t = 27 + 39 = 66 seconds

The net displacement from the front door to the bench is the distance from the front door to the windmill subtracted by the distance from the windmill to the bench

s = 50 - 30 = 20 m

So the average velocity is net displacement divided by total time

v = s / t = 20 / 66 = 0.3 m/s

The total distance from the front door to the bench is the sum of distance from the front door to the windmill and the distance from the windmill to the bench

S = 50 + 30 = 80 m

So the average speed is total distance divided by total time

v = s / t = 80 / 66 = 1.21 m/s

8 0

2 years ago

When a boxer is moving away from a punch, the force experienced is reduced because:

emmasim [6.3K]

Momentum transfer is reduced

5 0

2 years ago