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3 years ago

_____ developed the universal law of gravitation.

Physics

2 answers:

Sati [7]3 years ago

8 0

Answer: Newton

Explanation:

Anton [14]3 years ago

4 0

Sir Issac Newton developed the Universal law of Gravitation.

<u>Explanation :</u>

With the interesting quest for the answer why does the apply fall from a tree on the Earth, one of the wisest scientists Sir Issac Newton started investigating the action and thus developed the Universal law of Gravitation by estimating what caused the motionless apply to accelerate towards the Earth.

According to his second law of motions, an objects which are at rest (apply attached to the twig of the tree) could get in motion (fall towards the Earth) only through an external force exerted on him by the Earth. He called this force has “Gravity” or the “Gravitational Force”.

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Science question: How do humans use the magnetic field for navigation?

I am Lyosha [343]

Answer:

Magnetoreception (also magnetoception) is a sense which allows an organism to detect a magnetic field to perceive direction, altitude, or location. This sensory modality is used by a range of animals for orientation and navigation, and as a method for animals to develop regional maps.

Explanation:

4 0

2 years ago

A ski lift carries a 75.0-kg skier at 3.00 m/s for 1.50 min along a cable that is inclined at an angle of 40.0° above the horizo

Nookie1986 [14]

Answer

given,

mass of the ski = 75 Kg

speed of the skier, v = 3 m/s

time = 1.50 min = 90 s

angle of inclination, θ = 40°

distance = s x t

= 3 x 90 = 270 m

a) W = F. d cos θ

W = mg. d cos θ

W = 75 x 9.8 x 270 x cos 40°

W = 152021.52 J

work is done by the ski lift is equal to 152021.52 J

b) Power extended by the ski

$Power = \dfrac{Work\ done}{time}$

$Power = \dfrac{152021.52}{90}$

P = 1689.13 Watt.

power is expended by the ski lift is equal to 1689.13 W.

3 0

2 years ago

Therese plays lacrosse, but she has injured her ankle and has to take a few weeks off. She is finding that she has a lot of trou

vivado [14]

Answer: No endorphins

Explanation: cuz' she injured her ankle

6 0

2 years ago

(1 point) A projectile is fired from ground level with an initial speed of 600 m/sec and an angle of elevation of 30 degrees. Us

konstantin123 [22]

Answer:

(a) The range of the projectile is 31,813.18 m

(b) The maximum height of the projectile is 4,591.84 m

Explanation:

Given;

initial speed of the projectile, u = 600 m/s

angle of projection, θ = 30⁰

acceleration due to gravity, g = 9.8 m/s²

(a) The range of the projectile in meters;

$R = \frac{u^2sin \ 2\theta}{g} \\\\R = \frac{600^2 sin(2\times 30^0)}{9.8} \\\\R = \frac{600^2 sin (60^0)}{9.8} \\\\R = 31,813.18 \ m$

(b) The maximum height of the projectile in meters;

$H = \frac{u^2 sin^2\theta}{2g} \\\\H = \frac{600^2 (sin \ 30)^2}{2\times 9.8} \\\\H = \frac{600^2 (0.5)^2}{19.6} \\\\H = 4,591.84 \ m$

$v^2 = u^2 + 2gh\\\\v^2 = 600^2 + (2 \times 9.8)(4,591.84)\\\\v^2 = 360,000 + 90,000.064\\\\v = \sqrt{450,000.064} \\\\v = 670.82 \ m/s$

5 0

2 years ago

A beam of protons is directed in a straight line along the +z direction through a region of space in which there are crossed ele

IceJOKER [234]

Answer:

B = 7.6 T direction of + x

Explanation:

For the proton beam to continue in the same direction the electric and magnetic forces must be equal

$F_{m} - F_{e}$ = 0

$F_{m}$ = F_{e}

Fm = q E

The electric force is in the direction of the electric field because it is the charge of the positive proton, the electric force goes in the direction of –y, therefore, the magnetic force cancels this force must go in the direction of + y

The magnetic force is

F_{m} = q v x B = q v B sin θ

θ = 90

B = q E / q v

B = E / v

B = 800/105

B = 7.6 T

To find the direction of the magnetic field we use the right hand rule, the thumb goes in the direction of the proton velocity, the fingers extended in the direction of the magnetic field and the palm is the direction of force, for a positive charge.

Thumb goes in the direction of the + z axis

Palm in the direction of +y

Fingers point in the direction of + x

7 0

2 years ago