Ask question

Ask question

All categories

Romashka-Z-Leto [24]

3 years ago

15

Planets in our solar system do not revolve around the sun in perfect circles. Their orbits are more like ovals that scientists d

escribe as which of the following?
A. revolutionary
B. rotational
C. periodical
D. elliptical

1 answer:

n200080 [17]3 years ago

5 0

The scientists describe them as D. Elliptical

You might be interested in

Amazon has hired you to help design a new fleet of robots to work in their warehouse. You are trying to decide how powerful the

solmaris [256]

The minimum power is 490 W

Explanation:

The work that needs to be done by the robot in order to climb the shelves is equal to the gain in gravitational potential energy of the robot + object, therefore:

$W=mg \Delta h$

where

m = 15 kg + 5 kg = 20 kg is the total mass of the system

$g=9.8 m/s^2$ is the acceleration of gravity

$\Delta h = 20 m$ is the change in height

Substituting,

$W=(20)(9.8)(20)=3,920 J$

Now we can calcualte the power (wattage) that the robot must have, using the equation

$P=\frac{W}{t}$

where

W = 3,920 J is the work done

t = 8 s is the time interval

Substituting,

$P=\frac{3920}{8}=490 W$

Learn more about power:

brainly.com/question/7956557

#LearnwithBrainly

3 0

3 years ago

1.A worker pulls horizontally on a crate across a rough horizontal surface, causing it to move forward with constant velocity. F

Ymorist [56]

1. Answer:

The relationship between Force A and Force B is given as:

A = B

Explanation:

To produce acceleration to a body, an unbalanced force must be applied. Meaning that a Force must be applied to the body greater than that of Force of Friction.

In our case, a Force A is exerted on the crate which is moving with a constant velocity. As there is no acceleration, the force applied must be equal to the force of Friction B.

2. Answer:

The electron's acceleration is 1.756 x 10¹⁷ ms⁻².

Explanation:

Electric field exerts a Force on the electron given as:

F = 1.6 x 10⁻¹³ N

Rest mass of electron = 9.11 x 10⁻³¹ kg

According to newton's 2nd law of motion, a net force F applied on the electron must produce an acceleration 'a' which is directly proportional to the Force and inversely proportional to the rest mass of the electron given as:

a = F/m

a = (1.6 x 10⁻¹³)/(9.11 x 10⁻³¹)

a = 1.756 x 10¹⁷ ms⁻²

4 0

3 years ago

A car is traveling to the right at constant speed along a flat, horizontal road. Its four tires are all the same size and are ro

MaRussiya [10]

Answer:

C. the bottom

Explanation:

The tires of the car is rolling without slipping. In this case, the bottom of the tire that contacts the surface must be at rest in order to prevent slipping. Of course this is instantaneously. The tire has a translational velocity, v, and also at the bottom a rotational velocity, -v, and the sum is zero for the bottom.

6 0

3 years ago

Give 2 examples of each major cell group?

lutik1710 [3]

Answer:

The Prokaryotic Cells and The Eukaryotes

5 0

3 years ago

A 14-gauge copper wire of diameter 1.628 mm carries a current of 12.5 What is the potential difference across a 2.00 - m length

Dvinal [7]

Answer:

$V=1.76\times 10^{-4}\ V$

Explanation:

Given that,

The diameter of a wire, d = 1.628 mm

Radius, r = 0.814 mm = 0.000814m

Current, I = 12.5 mA

The length of the wire, l = 2m

The resistivity of the wire, $\rho=1.47\times 10^{-8}\ \Omega-m$

We need to find the potential difference across the wire. We know that the resistance of the wire is given by :

$R=\rho\dfrac{l}{A}$

Also, V = IR

$\dfrac{V}{I}=\rho\dfrac{l}{A}\\\\V=\dfrac{\rho l I}{A}\\\\V=\dfrac{1.47\times 10^{-8}\times 2\times 12.5\times 10^{-3}}{\pi \times (0.000814)^2}\\\\V=1.76\times 10^{-4}\ V$

So, the potential difference of the wire is $1.76\times 10^{-4}\ V$ .

7 0

3 years ago