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3 years ago

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What is meant by the term blue moon

1 answer:

Andreyy893 years ago

4 0

“Once in a blue moon” is a common expression that has been used for a long time, and which means 'not very often,' or 'very rarely. ' It often refers to an extra full moon; however, it has been used to describe the way the moon actually looked, when for different reasons it had turned a blueish color.
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Joan is setting up an experiment in the lab to observe newton's second law of motion. she has a model car that has a mass of 45

Radda [10]

The force of the car increases because it is proportional to the acceleration of the object (as stated in the second law). If the object accelerates then the force accelerates, if the acceleration decreases then the force decreases. Same for mass. The force of the car would have changed from 315 newtons of force to 1,260 newtons of force.

8 0

3 years ago

I need help with this problem

frosja888 [35]

Answer:

v = dr/dt = 7t x + 0 y + (- 4) z

a = dv/dt = 7 x + 0 y + 0 z

t = 0:

v = (-4) z

a = 7 x

Explanation:

v = dr/dt = 7t x + 0 y + (- 4) z

a = dv/dt = 7 x + 0 y + 0 z

t = 0:

v = (-4) z

a = 7 x

6 0

2 years ago

If sound waves require a medium (material) to vibrate in order to produce a sound, can sound waves travel in outer space? Why or

soldier1979 [14.2K]

Sound waves requires a medium (material) to vibrate in order to produce a sound. So sound waves cannot travel in outer space as it is vacuum.

8 0

3 years ago

a boy Held a book of weight 50 newton’s in his fully outstretched hand, at a distance of 50 cm away calculate the moment of forc

miss Akunina [59]

Answer:

the moment of force is 25 Nm.

Explanation:

Given;

weight of the book, F = 50 N

distance through which his hand was stretched, d = 50 cm = 0.5 m

The moment of force is calculated as;

moment of force = F x r

moment of force = 50 N x 0.5 m

moment of force = 25 Nm

Therefore, the moment of force is 25 Nm.

7 0

3 years ago

A block is balanced on top of a frictionless sphere of radius R. When the block is given a slight nudge it starts to slide down

Nataly_w [17]

Answer: $\frac{R}{3}$

Explanation:

Given

Sphere of Radius R

Suppose mass of block is m

At any instant \theta Normal reaction(N) and weight(mg) is acting such that

$mg\sin \theta -N=\frac{mv^2}{R}$ , where v is velocity of block at any angle \theta

When block is just about to leave then N=0

therefore

$mg\sin \theta =\frac{mv^2}{R}$

$v^2=gR\sin \theta$ -------------------1

Also by conserving Energy we get

Potential Energy=kinetic Energy of block

$mgh=\frac{mv^2}{2}$

here h=vertical distance traveled by block

From diagram

$h=R-R\sin \theta$

$h=R(1-\sin \theta )$

$mgR(1-\sin \theta )=\frac{mv^2}{2}$

$2gR(1-\sin \theta )=v^2$ -----------------2

From 1 and 2

$2(1-\sin \theta )=\sin \theta$

$3\sin \theta =2$

$\sin \theta =\frac{2}{3}$

Thus from this value of h is

$h=R(1-\sin \theta )$

$h=R(1-\frac{2}{3})$

$h=\frac{R}{3}$

3 0

4 years ago