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2 years ago

15

Please help me on this!

1 answer:

Luda [366]2 years ago

4 0

Answer:

c or b

Explanation:

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ololo11 [35]

The first Law of motion states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

<h3>What is motion?</h3>

Motion is defined as the process of changing the position of an object from one place to another.

Newton postulated three laws of motion of which the first Newton's law of Motion is that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

Learn more about force here:

brainly.com/question/12785175

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6 0

2 years ago

Radioactive isotopes are used to treat cancer true or false

Nataly [62]

Yes, radioactive isotopes are used to treat cancer by doing special x-ray kind of things.

8 0

3 years ago

A crate is pulled by a force (parallel to the incline) up a rough incline. The crate has an initial spped shown in the figure be

Phantasy [73]

Answer:

(a) Kinetic energy of the cart is 648.32 J.

(b) Speed of the cart is 11.44 m/s.

Explanation:

From the attached below figure we came to know that,

Mass of the crate is 10 kg (m)

Initial speed of the crate is 1.2 m/s (v)

Coefficient of friction on a rough plane is 0.286 (µ)

Force on the cart is 150 N (F)

The distance which crate is moved (d) is 8.05 m.

Calculation of kinetic energy:

Acceleration of the cart:

We know that,

F = F – m × g × sinθ - µ × m × g × cosθ (F = ma)

m × a = F – m × g × sinθ - µ × m × g × cosθ

10 × a = 150 – (10 × 9.8 × sin 27) – (0.286 × 10 × 9.8 × cos 27)

10 × a = 150 – 44.49 – 24.97

10 × a = 80.54

Calculation of speed:

Change in kinetic energy = m × a × d

Change in kinetic energy = 10 × 8.054 × 8.05

Change in kinetic energy = 648.32 J

Explanation:

7 0

3 years ago

A thin soap bubble of index of refraction 1.33 is viewed with light of wavelength 550.0nm and appears very bright. Predict a pos

Firlakuza [10]

Answer:

Thickness = 103.38 nm

Explanation:

Given that:

The refractive index of the thin soap bubble = 1.33

The wavelength of the light = 550 nm

The minimum thickness that produces a bright fringe can be calculated by using the formula shown below as:

$Thickness=\frac {\lambda}{4\times n}$

Where, n is the refractive index of the thin soap bubble = 1.33

${\lambda}$ is the wavelength

So, thickness is:

$Thickness=\frac {550\ nm}{4\times 1.33}$

<u>Thickness = 103.38 nm</u>

3 0

3 years ago

A parachutist's fall to Earth is determined by two opposing forces. A gravitational force of 605 N acts on the parachutist. Afte

Doss [256]

Answer:15.8 m/s

Explanation:

Given

Gravitational Force $F_g=605 N$

Air resistance $F_d=689 N$

mass of Parachutist $=\frac{605}{9.8}=61.73 kg$

Velocity after $3 s$

$v=u+at$

$v=0+9.8\times 3$

$v=29.4 m/s$

Now Parachutist opens the parachute

Net for on Parachutist

$605-689=-84$

$84 N$ drag force

therefore deceleration $\frac{84}{61.73}=1.36 m/s^2$

velocity after 10 s is

$v_1=v+at$

$v_1=29.4-1.36\times 10$

$v_1=15.8 m/s$

7 0

3 years ago