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4 years ago

10

You and your friend are having a discussion about weight. He claims he weighs less on the 100th floor of a building that he does

on ground floor. Is he correct?

1 answer:

balu736 [363]4 years ago

7 0

No the acceleration of gravity on earth is still 9.8ms-2 unless he was on a different planet

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A woman and her dog are out for a morning run to the river, which is located 4.0 KM away. The woman runs at 2.5 M/S in a straigh

VLD [36.1K]

River shore is located at distance

$d = 4 km$

speed of the woman is given as

$v_1 = 2.5 m/s$

now the time taken by the woman to cover the distance is

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

$t = \frac{4000}{2.5} = 1600 s$

for the same time interval the dog will run to and fro with speed 4.5 m/s

so the total distance moved by the dog is given by

$d = v* t$

$d = 4.5 * 1600$

$d = 7200 m$

<em>so the total distance that dog will move is 7200 m or 7.2 km</em>

8 0

4 years ago

An electric drill transfers 200 J of energy into a useful kinetic energy store. It also transfers 44 J of energy by sound and 48

kramer

Answer:

Er = 108 [J]

Explanation:

To solve this problem we must understand that the total energy is 200 [J]. Of this energy 44 [J] are lost in sound and 48 [J] are lost in heat. In such a way that these energy values must be subtracted from the total of the kinetic energy.

200 - 44 - 48 = Er

Where:

Er = remaining energy [J]

Er = 108 [J]

3 0

3 years ago

Lin suffers from pain in her right wrist. Several doctors check her wrist regularly over a period of time. Doctors' notes and

FromTheMoon [43]

Answer:

D

Explanation:

They looked at her hand and made a formal conclusion from that

4 0

3 years ago

A particle has a de Broglie wavelength of 2.1 × 10-10m. Then its kinetic energy increases by a factor of 3. What is the particle

svlad2 [7]

Answer:

$\lambda' =1.21\times 10^{-10}\ m$

Explanation:

given,

de broglie wavelength of the particle = 2.1 × 10⁻¹⁰m

Kinetic energy increase factor = 3

de broglie wavelength of new particle = ?

we know,

$P = \dfrac{h}{\lambda}$

Kinetic energy

$K =\dfrac{p^2}{2m}$

$K =\dfrac{h^2}{2m\lambda^2}$ ...........(1)

Kinetic energy of other particle

$3K =\dfrac{h^2}{2m\lambda'^2}$ ............(2)

dividing equation (1)/(2)

$\dfrac{1}{3} =\dfrac{\lambda'^2}{\lambda^2}$

$\lambda' = \dfrac{\lambda'}{\sqrt{3}}$

$\lambda' = \dfrac{2.1\times 10^{-10}}{\sqrt{3}}$

$\lambda' =1.21\times 10^{-10}\ m$

6 0

3 years ago

Which is an example of

Kipish [7]

Answer:

A. an apple falling from a tree

Explanation:

8 0

3 years ago