I NEED HELP ASAP

In order to do work, the force vector must be

gregori [183]

As we know that total work done by a force is given by

$W = F.d$

$W = Fdcos\theta$

so it is product of force and displacement along same direction

as we can write it as

$W = (Fcos\theta)(d)$

so it must be the product of force and displacement in same directions so correct answer must be

<u>B. in the same direction as the displacement vector and the motion.</u>

6 0

3 years ago

Read 2 more answers

Which type of bond and how many bonds would occur as carbon dioxide (CO2) is formed from carbon in Group IVA and oxygen in Group

Rus_ich [418]

Answer:

The answer is D. Four covalent bounds

5 0

3 years ago

A baseball leaves a bat with a horizontal velocity of 20.0 m/s. When it has left the bat for a time of 0.250 s (Assume air resis

miss Akunina [59]

Answer:

The distance is 5 m.

Explanation:

Given that,

Horizontal velocity = 20.0 m/s

Time t = 0.250 s

We need to calculate the horizontal distance

The distance traveled by the baseball with horizontal velocity in time t is given by

Using formula for horizontal distance

$d = v\times t$

$d = 20.0\times0.250$

$d=5\ m$

Hence, The distance is 5 m.

5 0

3 years ago

What tension would you need to make a middle c (261.6 hz) fundamental mode on a 1 m string (for example, on a harp)? the linear

Allisa [31]

The frequency of middle C on a string is
f = 261.6 Hz.

The given linear density is
ρ = 0.02 g/cm = (0.02 x 10⁻³ kg)/(10⁻² m)
= 0.002 kg/m

The length of the string is L = 1 m.

Let T = the tension in the string (N).
The velocity of the standing wave is
$v= \sqrt{ \frac{T}{\rho} }$

In the fundamental mode, the wavelength, λ, is equal to the length, L.
That is
Because v = fλ, therefore
$\sqrt{ \frac{T}{\rho} } =f \lambda = fL \\\\ \frac{T}{\rho} = (fL)^{2} \\\\ T = \rho (fL)^{2}$

From given information, obtain
T = (0.002 kg/m)*(261.6 1/s)²*(1 m)²
= 136.87 N

Answer: 136.9 N (nearest tenth)

4 0

3 years ago

In a drill during basketball practice, Sally runs the length of the 30- meter court and back. Sally does this in 60 seconds. Wha

Juliette [100K]

Hey!

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Formula:

speed = distance ÷ time

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Solution:

Distance is 60 meters.

Time is 60 seconds.

speed = 60 / 60

speed = 1 meters/seconds

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Answer:

1 meters/seconds.

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Hope This Helped! Good Luck!

6 0

3 years ago