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Aleks04 [339]
3 years ago
5

A flowerpot falls off a windowsill and falls past the window below. You may ignore air resistance. It takes the pot 0.400 s to p

ass from the top to the bottom of this window, which is 2.10 m high.
Physics
1 answer:
Rudiy273 years ago
4 0

Answer:

0.55 m

Explanation:

Parameters given:

Time taken to pass from the top of the window to the bottom = 0.4 s

Height of the window = 2.10 m

Given that we know the time taken for the flowerpot to fall the height of the window, we can find the initial velocity of the pot. Using one of Newton's equations of motion:

S = u*t + 0.5*g*(t^2)

Given that

g = +9.8m/s^2,

S = 2.1 m

t = 0.4 s

=> 2.1 = 0 4*u + (0.5 * 9.8 * 0.4 * 0.4)

2.1 = 0.4u + 0.784

=> 0.4u = 1.316

u = 3.29 m/s

We know that the flowerpot fell from a window above, hence, the final velocity of its fall from above is equal to the initial velocity of when it starts falling from top of the window below.

Using another equation of motion, we have that:

v^2 = u^2 + 2gs

Where

s = height of the window above to the top of the window below

v = 3.29 m/s

u = 0 m/s

3.29^2 = 0 + 2*9.8*s

10.82 = 19.6s

=> s = 0.55 m

Hence, the top of the window above is 0.55m far from the top of the window below.

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A converging lens of focal length 20 cm is placed in contact with a diverging lens of focal length 30 cm. The focal length of th
kramer

Answer:

The focal lenth (F) =+10.0cm

Explanation:

The formular for combined focal length (F) is given as;

1/f = 1/f_{1} + 1/f_{2}

In this  question,

F1 = 20cm

F2  = -30cm

Plugging the values into the formuar above,

1/f = 1/20 + 1/(-30)

1/f = 0.05 - 0.033[tex]1/f = -0.017f = [tex]1/ -0.017

f = 58.82cm

i.e. the combination behaves as a converging lens (because of the postive sign) of focal length 58.82cm .

7 0
3 years ago
A single-turn circular loop of wire of radius 45 mm lies in a plane perpendicular to a spatially uniform magnetic field. During
Lina20 [59]

Answer:

Magnitude of induced emf is 0.00635 V

Explanation:

Radius of circular loop r = 45 mm = 0.045 m

Area of circular loop A=\pi r^2

A=3.14\times 0.045^2=0.00635m^2

Magnetic field is increases from 250 mT to 350 mT

Therefore change in magnetic field dB=250-350=100mT

Emf induced is given by

e=-N\frac{d\Phi }{dt}=-NA\frac{dB}{dt}

e=-0.00635\times \frac{100\times 10^{-3}}{0.10}=-0.00635V

Magnitude of induced emf is equal to 0.00635 V

7 0
3 years ago
Fbejfsjnvfdjbesjkbf dsjlbc dsjlc
pav-90 [236]

Answer:

???

Explanation:

7 0
3 years ago
Read 2 more answers
Harry and ron set up this experiment with a glider, whose mass they have measured to be 565 g, and seven washers hanging from th
svetlana [45]
Let's call m=565~g=0.565~kg the mass of the glider and m_w=7\cdot12~g =84~g=0.084~kg the total mass of the seven washers hanging from the string. 
The net force on the system is given by the weight of the hanging washers:
F_{net} = m_w g
For Newton's second law, this net force is equal to the product between the total mass of the system (which is m+m_w) and the acceleration a:
F_{net}=(m+m_w)a
So, if we equalize the two equations, we get
m_w g = (m+m_w)a
and from this we can find the acceleration:
a= \frac{m_w g}{(m+m_w)} = \frac{0.084~kg \cdot 9.81~m/s^2}{(0.565~kg+0.084~kg)}=1.27~m/s^2
5 0
3 years ago
Which of the following is an example of acceleration?
Naddika [18.5K]

Answer:

c

Explanation:

When a satellite is orbiting the earth , a constant force is being applied on it which means it must has acceleration. Also the direction of satellite is always being changed when it is orbitting to there is always change in the velocity vector which means acceleration.

You can view in the attached diagram to understand how the velocity is being changed.

7 0
3 years ago
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