Nicholas spends 20 minutes ironing shirts with his 1,800-watt iron. How many joules of energy were used

The organization of former British colonies that includes Canada, India, Pakistan, and other countries is called the __________.

Troyanec [42]

B. League of Nations failed and was not a member of A. United nations which was established after its failure. So, The organization of former British colonies that includes Canada, India, Pakistan, and other countries is called the C. Commonwealth of Nations.

3 0

3 years ago

Read 2 more answers

A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse

NISA [10]

Answer:

The time interval is $t = 5.48 *10^{-3} \ s$

Explanation:

From the question we are told that

The length of the string is $l = 3.00 \ m$

The mass of the string is $m = 5.00 \ g = 5.0 *10^{-3}\ kg$

The tension on the string is $T = 500 \ N$

The velocity of the pulse is mathematically represented as

$v = \sqrt{ \frac{T}{\mu } }$

Where $\mu$ is the linear density which is mathematically evaluated as

$\mu = \frac{m}{l}$

substituting values

$\mu = \frac{5.0 *10^{-3}}{3}$

$\mu = 1.67 *10^{-3} \ kg /m$

Thus

$v = \sqrt{\frac{500}{1.67 *10^{-3}} }$

$v = 547.7 m/s$

The time taken is evaluated as

$t = \frac{d}{v}$

substituting values

$t = \frac{3}{547.7}$

$t = 5.48 *10^{-3} \ s$

5 0

4 years ago

A skateboarder jumps horizontally off the top of a staircase at a speed of 14.5 – and lands at bottom of the

Marrrta [24]

Question:

A skateboarder jumps horizontally off the top of a staircase at a speed of 14.5 and lands at bottom of the stairs. The staircase has a horizontal length of 8.00 m. We can ignore air resistance. What is the skater's vertical displacement during the jump?

Answer:

y = 1.48 m

Explanation:

Projectile motion is a two dimensional motion experienced by an object or particle that is subjected near the Earth's surface and moves along a curved path under the influence of gravity only. The path followed by projectile motion is called projectile path.

As the skateboarder followed the projectile path, and we know that in projectile motion the horizontal component of the velocity remain constant throughout his motion. So there is no acceleration along horizontal path.

Also Skateboard jumps horizontally, So initial velocity has only horizontal component.

Horizontal component of initial velocity = $v_{i_{x}}$ = 14.5 m/s

Horizontal displacement = x = 8.00 m

Vertical displacement = y = ?

Using the following formula

x = $v_{i_{x}}$ t

8 = (14.5)(t)

t = 0.55 s

As skateboarder jumps horizontally, So there is no vertical component of velocity.

According to 2nd equation of motion

y = $v_{i_{y}}t + \frac{1}{2}gt^{2}$

As $v_{i_{y}} = 0$

So

y = 0.5gt²

y = 0.5*9.8*(0.55)²

y = 1.48 m

8 0

3 years ago

Read 2 more answers

Which sporting event is symbolic of American culture?

Zolol [24]

Baseball is known as americas past time

7 0

4 years ago

Read 2 more answers

A passenger on an interplanetary express bus traveling at = 0.95 takes a 9.0-minute catnap, according to her watch.How long does

Nimfa-mama [501]

Answer:

28.82 minutes

Explanation:

This problem is an example of time dilatation by acceleration. The formula is:

$\Delta t=\gamma \Delta t_0=\frac{\Delta t_0}{\sqrt{1-\frac{v^2}{c^2} }}$

$\Delta t$ is the time measured by the observer on a fixed position (in this case in the fixed planet), $\Delta t_0$ is the time measured by the person moving away from the fixed observer (the one on an interplanetary express bus), $c$ is the speed of light and $v$ the velocity of the observer that is moving away (the velocity of the ship).

$\Delta t_0=9 min=540s\\\Delta t=\frac{540}{\sqrt{1-\frac{(0.95c)^2}{c^2}}}=\frac{540}{\sqrt{1-\frac{0.95^2c^2}{c^2}}}=\frac{540}{\sqrt{1-0.95^2}}\\\Delta t=\frac{540}{\sqrt{1-0.9025}}=\frac{540}{\sqrt{0.0975}}=\frac{540}{0.3122}=1729.38s\\\Delta t=28.82minutes$

6 0

4 years ago