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3 years ago

Propose a situation where friction is undesirable.

Physics

1 answer:

Naddik [55]3 years ago

6 0

Trying to move a large object such as a furniture piece across carpet.

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What are the strengths and limitations of the doppler and transit methods? What kind of planets are easiest to detect with each

Arturiano [62]

$\huge\mathfrak\red{✔Answer:-}$

Strength: able to detect planets in a wide range of orbits, as long as orbits aren't face on

Limitations: yield only planet's mass and orbital properties

3 0

4 years ago

We wish to obtain a equal sized inverted image of a candel flame on a screen kept at a distance of 4m from the candle flame a) n

soldier1979 [14.2K]

A) To obtain an inverted image of an object of same size a convex lens is used.

In this question we have given

Distance between candle flame and screen=4

it means distance between candle flame and lens +distance between lens and screen =4m

u+v= 4m

u= v

therefore, 2u= 4m

or, u=-2m ( u is taken negative because it lies on left side of the lens)

and v=2m

we have to find the focal length of convex lens

$\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$ $\frac{1}{f} = \frac{1}{2} - ( - \frac{1}{2} ) \\ \frac{1}{f} = \frac{1}{1}\\ f = 1m$

Hence, Focal length of the lens is 1m

and lens should be placed at a distance of 2m from the flame

4 0

3 years ago

A baseball is thrown 50.0m in 3.0s, what is the average speed of the baseball? Calculated answer is 16.666667! What is the corre

castortr0y [4]

Answer:

20m/s

Explanation:

Given parameters:

Distance of throw = 50m

Time = 3s

Unknown:

Average speed = ?

Solution:

Average speed is distance divided by time;

Average speed = $\frac{distance }{time}$

Insert the parameters and solve;

Average speed = $\frac{50}{3}$ = 16.66667m/s = 20m/s

5 0

3 years ago

The radius RH of a black hole, also known as the event horizon, marks the location where not even light itself can escape from t

olga nikolaevna [1]

Solution:

a) We know acceleration due to gravity, g = GM/r²

Differential change, dg/dr = -2GM/r³

Here, r = 50*Rh = 50*2GM/c² = 100GM/c ²

My height, h=dr = 1.7 m

Difference in gravitational acceleration between my head and my feet, dg = -10 m/s²

or, dg/dr = -10/1.7 = -2GM/(100GM/c²)³

or, 5.9*100³*G²*M² = 2c⁶

or, M = 0.59*c³/(1000G) = 2.39*1032 kg = [(2.39*1032)/(1.99*1030 )]Ms = 120*Ms

Mass of black hole which we can tolerate at the given distance is 120 time the mass of Sun.

b) This limit an upper limit ,we can tolerate smaller masses only.

4 0

3 years ago

. A horizontal steel spring has a spring constant of 40.0 N/m. What force must be applied to the spring in order to compress it

ANEK [815]

Ans 4 more to be exact

Explanation:

7 0

3 years ago