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4 years ago

Quartz gold and calcite are examples of?coal is what

Physics

1 answer:

givi [52]4 years ago

5 0

Quartz, gold and calcite are examples of minerals, coal is a fossil fuel

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A phone cord is 6.48 m long. The cord has a mass of 0.253 kg. A transverse wave pulse is produced by plucking one end of the tau

monitta

Answer:

136.27 N

Explanation:

From the question,

The velocity of the pulse is given as

v = L/t................. Equation 1

Where v = velocity of the pulse, L = total length of the pulse, t = time.

Given: L = 4×2×6.48 (as the pulse makes four tips down and back) = 51.84 m, t = 0.877 s.

substitute into equation 1

v = 51.84/0.877

v = 59.11 m/s.

Using,

But,

v = √(T/m')................... Equation 2

Where T tension in the cord, m' = mass per unit length of the cord.

make T the subject of the equation

T = v²m'.................... Equation 3

Given: v = 59.11 m/s, m' = 0.253/6.48 = 0.039 kg/m

Substitute into equation 3

T = 59.11²(0.039)

T = 136.27 N

Hence the tension in the cord = 136.27 N

6 0

4 years ago

A joule, which is a unit of work, is equal to?

sweet-ann [11.9K]

Option A is correct

4 0

3 years ago

A particle undergoes two displacements. The first has a magnitude of 11 m and makes an angle of 82 ◦ with the positive x axis. T

Luden [163]

Answer:

$\theta = 211.7 degree$

Explanation:

First displacement of the particle is given as

$r_1$ = 11 m at 82 degree with positive X axis

so we can say

$\vec r_1 = 11 cos82 \hat i + 11 sin82 \hat j$

$\vec r_1 = 1.53\hat i + 10.9 \hat j$

resultant displacement of the particle after second displacement is given as

r = 8.7 m at 135 degree with positive X axis

so we can say

$r = 8.7 cos135\hat i + 8.7 sin135\hat j$

$r = -6.15 \hat i + 6.15 \hat j$

now we know that

$r = r_1 + r_2$

now we have

$r_2 = r - r_1$

so we will have

$r_2 = (-6.15 \hat i + 6.15 \hat j) - (1.53\hat i + 10.9 \hat j)$

$r_2 = -7.68 \hat i - 4.75 \hat j$

so angle of the second displacement is given as

$tan\theta = \frac{r_y}{r_x}$

$tan\theta = \frac{-4.75}{-7.68}$

$\theta = 211.7 degree$

8 0

3 years ago

Which statement correctly describes the differences between positive and negative acceleration?

Afina-wow [57]

Answer:c) Positive acceleration describes an increase in speed; negative acceleration describes a decrease in speed.

Hey

I tried to answer before and it dident let me.

8 0

3 years ago

Developed nations are usually highly industrialized. TRUE FALSE

DIA [1.3K]

True

But
We
Should
.......... to study

6 0

3 years ago