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3 years ago

The moon has been orbiting the earth at the same speed for millions of years. This is an example of Newton’s 1st Law because

Physics

1 answer:

alekssr [168]3 years ago

4 0

Answer:

an object remains at rest (or motion) unless acted upon by an outside force

Explanation:

force that created the moon imparted velocity which was restrained by the gravitational pull of the earth

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Abigail runs one complete lap (400m) around the track, while Gabi runs a 50 meter dash in a straight line. Which runner had a gr

Ipatiy [6.2K]

Answer:

$\boxed {\boxed {\sf Gabi \ had \ greater \ displacement}}$

Explanation:

Displacement is the change in the position of an object.

Abigail runs a complete lap around the track, which is 400 meters. Even though she ran 400 meters, she has no displacement. If she starts and ends at the same spot, there is no change in position.

Gabi runs a 50 meter dash in a straight line. Gabi has 50 meters of displacement. She runs in a straight line and is 50 meters away from where she began.

While Abigail ran the farther distance, Gabi had the greater displacement.

4 0

3 years ago

Read 2 more answers

Ice skaters often end their performances with spin turns, where they spin very fast about their center of mass with their arms f

vampirchik [111]

Answer:

$\large \boxed{\text{30 rev/s}}$

Explanation:

This question is based on the Law of Conservation of Angular Momentum.

Angular momentum (L) equals the moment of inertia (I) times the angular speed (ω).

L = Iω

If momentum is conserved,

I₁ω₁ = I₂ω₂

Data:

I₁ = 3.5 kg·m²s⁻¹

ω₁ = 6.0 rev·s⁻¹

I₂ = 0.70 kg·m²s⁻¹

Calculation:

$\begin{array}{rcl}I_{1}\omega_{1} &= &I_{2}\omega_{2}\\\text{3.5 kg$\cdot$m$^{2}$}\times \text{6.0 rev/s} &= &\text{0.70 kg$\cdot$m$^{2}$}\times\omega_{2}\\\text{21 rev/s} &= &0.70\omega_{2}\\\omega_{2} & = & \dfrac{\text{21 rev/s}}{0.70}\\\\&=&\textbf{30 rev/s}\\\end{array}\\\text{The skater's final rotational speed is $\large \boxed{\textbf{30 rev/s}}$}$

8 0

4 years ago

Kinetic energy is energy that is stored and not moving O True O False

trasher [3.6K]

The answer to this is that it is FALSE!

4 0

2 years ago

A student solving a physics problem for the range of a projectile has obtained the expression

Alika [10]

Answer:

The range of the projectile is 66.7 meters.

Explanation:

The range of a projectile is given by the following expression as :

$R=\dfrac{v_o^2\ sin2\theta}{g}$ ..............(1)

$v_o=37.2\ m/s$

$\theta=14.1^{\circ}$

$g=9.8\ m/s^2$

The range can be calculated using equation (1). Putting the values of all parameters we get :

$R=\dfrac{(37.2)^2\ sin2(14.1)}{9.8}$

R = 66.7 meters

So, the range of the projectile is 66.7 meters. Hence, this is the required solution.

6 0

3 years ago

The figure below shows regions of the electromagnetic

nika2105 [10]

Answer:

The electromagnetic spectrum in order of increasing frequency is - radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays.

The frequency of the gamma rays is >3×10

Hence, the gamma rays has the maximum frequency in the electromagnetic spectrum.

6 0

3 years ago