All categories

3 years ago

HELPPPP MEEEEEEEEEEE Work = force × distance (W = Fd) In which scenario is the most work done?

Physics

1 answer:

Ket [755]3 years ago

3 0

Answer:

A parrot lifts a cracker off the ground to eat.

Explanation:

Work is said to be done by a force only if the force causes displacement.

Work (W) by a force (F) causing a displacement (d) is given as:

$W=Fd$

Displacement of an object is the net change in its position and a body that is not moving has zero displacement.

Let us check each option now.

Choice 1:

A parrot lifts a cracker off the ground to eat.

Here, the lifts a cracker off the ground. So, the parrot applies some force on the cracker and the cracker's position has changed.

So, there is work done by the parrot as force causes a displacement.

Choice 2:

A weightlifter holds a 150 pound barbell for 3 minutes.

Here, no work is done as the force applied to hold the barbell is not producing any displacement.

Choice 3:

A waiter holds a tray of 15 glasses of water over his head while standing at the front of a restaurant.

Here, no work is done as the force applied to hold the glasses of water is not producing any displacement.

Choice 4:

A truck motor runs for 24 hours while the truck is parked.

Here, no work is done as the force applied to run the motor is not producing any displacement (truck is parked).

So, the correct choice is first choice.

You might be interested in

The Hi line of the Balmer series is emitted in the transition from n = 3 to n = 2. Compute the wavelength of this line for l H a

irina1246 [14]

Answer:

$\lambda=550\ nm$

Explanation:

The Hi line of the Balmer series is emitted in the transition from n = 3 to n = 2 i.e. $n_i=3$ and $n_f=2$

The wavelength of Hi line of the Balmer series is given by :

$\dfrac{1}{\lambda}=R(\dfrac{1}{n_f}-\dfrac{1}{n_i})$

$\dfrac{1}{\lambda}=1.09\times 10^7\times (\dfrac{1}{2}-\dfrac{1}{3})$

$\lambda=5.50\times 10^{-7}\ m$

$\lambda=550\ nm$

So, the wavelength for this line is 550 nm. Hence, this is the required solution.

6 0

3 years ago

A large fraction of the ultraviolet (UV) radiation coming from the sun is absorbed by the atmosphere. The main UV absorber in ou

elena55 [62]

Answer:

$3.2\times 10^{-7}\ m$ or 0.32 μm.

Explanation:

Given:

The radiations are UV radiation.

The frequency of the radiations absorbed (f) = $9.38\times 10^{14}\ Hz$

The wavelength of the radiations absorbed (λ) = ?

We know that, the speed of ultraviolet radiations is same as speed of light.

So, speed of UV radiation (v) = $3\times 10^8\ m/s$

Now, we also know that, the speed of the electromagnetic radiation is related to its frequency and wavelength and is given as:

$v=f\lambda$

Now, expressing the above equation in terms of wavelength 'λ', we have:

$\lambda=\frac{v}{f}$

Now, plug in the given values and solve for 'λ'. This gives,

$\lambda=\frac{3\times 10^8\ m/s}{9.38\times 10^{14}\ Hz}\\\\\lambda=3.2\times 10^{-7}\ m\\\\\lambda=3.2\times 10^{-7}\times 10^{6}\ \mu m\ [1\ m=10^6\ \mu m]\\\\\lambda=3.2\times 10^{-1}=0.32\ \mu m$

Therefore, the wavelength of the radiations absorbed by the ozone is nearly $3.2\times 10^{-7}\ m$ or 0.32 μm.

7 0

3 years ago

What do you mean by kinetic energy and potential energy ?

Verizon [17]

Kinetic Energy of an object is the measure of the work an object can do by virtue of its motions..

Formula - KE = 1/2 mv^2

Where KE is the kinetic energy, m is the body’s mass, and v is the body’s velocity.

Potential energy is the stored energy in any object or system by virtue of its position or arrangement of parts..

Formula - W = mgh

Where,

. m is the mass in kilograms

. g is the acceleration due to gravity

. h is the height in meters

Hope it helpz~ uh..

4 0

1 year ago

What you filling your heart with <br>oxygen and blood

svlad2 [7]

Answer:

Explanation:

The right side of your heart receives oxygen-poor blood from your veins and pumps it to your lungs, where it picks up oxygen and gets rid of carbon dioxide. The left side of your heart receives oxygen-rich blood from your lungs and pumps it through your arteries to the rest of your body.

#I AM ILLITERATE

5 0

2 years ago

Read 2 more answers

A garden hose attached with a nozzle is used to fill a 10‐ gal bucket. The inner diameter of the hose is 2 cm, and it reduces to

nadya68 [22]

Answer:

Explanation:

Given

Volume of bucket $V=10\ gallon$