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Sauron [17]
4 years ago
8

On his way to class, a student on a skateboard is accelerating on a downhill stretch. Which of the following statements is true?

(Select all that apply.)
A.The skateboarder's acceleration is perpendicular to the net force.
B.The skateboarder is moving in the direction of the net force.
C.The skateboarder's acceleration is in the direction of the net force.
D.The skateboarder is subjected to a net external force in the direction of motion.
Physics
1 answer:
sasho [114]4 years ago
3 0

Answer:

B is correct

Explanation:

Because of gravity

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7) You think you have found a diamond. Its mass is 5.28 g and its volume is 2 cm3. Calculate the density
lesya [120]

Answer:

\boxed {\tt d=2.64 \ g/cm^3}

\boxed {\tt Not \ a \ diamond}

Explanation:

Density can be found by dividing the mass by the volume.

d=\frac{m}{v}

The mass is 5.28 grams and the volume is 2 cubic centimeters.

m=5.28 \ g\\v= 2 \ cm^3

Substitute the values into the formula.

d=\frac{5.28 \ g }{2 \ cm^3}

Divide.

d=2.64 \ g/c^3

The density of the unknown substance is 2.64 grams per cubic centimeter.

The density of a diamond is about 3.5 grams per cubic centimeter. Since 2.64 is not equal to 3.5, the unknown substance is not a diamond.

6 0
4 years ago
Two campers in a national park hike from their cabin to the same spot on a lake, each taking a different path, as illustrated be
elixir [45]

Answer:

<em>Their displacement is 5 Km from the cabin.</em>

Explanation:

The displacement is define is the shortest distance between two points. It is the shortest distance of a line that joins two points together. It quantifies both the distance and direction of the net or total motion along a straight line from the initial position to the final position of the point trajectory. In this case, the straight line joining the cabin to the stream is line S which is equal to 5 Km

3 0
3 years ago
If the wavelength of a wave of light is 4.57x10^-9 m what is the frequency
alexandr402 [8]

Answer:

6.5646\times 10^{16}~ \text{Hz}

Explanation:

\text{Frequency,}~ f= \dfrac{c}{\lambda} = \dfrac{3\times 10^8 }{4.57 \times 10^{-9}} = 6.5646\times 10^{16}~ \text{Hz}

5 0
3 years ago
A 90-g bead is attached to the end of a 60-cm length of massless string. The other end of the string is held at point O, which i
Gekata [30.6K]
Hope this helps you.

4 0
4 years ago
Much of the information taught in Earth-Space Science would not be available if it weren’t for our remote sensing abilities. Exp
boyakko [2]

Answer:

  1. collecting information
  2. imaging

Explanation:

Remote sensing means we do not have to be physically present in that particular area that we're studying by taking certain measurements. Several tools have been developed overtime to enable us to make this feat possible. Satellites in orbit have a major role to play in this regard. They exist to gather information from outer space and captures images that help us know more about our universe.

Hope that answers the question, have a great day!

8 0
3 years ago
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