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3 years ago

When an object slides,there is less friction than when it rolls

Physics

1 answer:

Butoxors [25]3 years ago

4 0

Answer:

False

Explanation:

Rolling friction takes place when an object rolls on the surface. Sliding friction takes place when two surfaces are rubbed against each other. Rolling friction is much less than sliding friction for same pair of bodies. When one body rolls upon another, there is theoretically no sliding or slip between them.

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The wavelength of light is given by the velocity divided by the frequency. the velocity of blue light is 300,000,000 m/sec, and

s2008m [1.1K]

Electromagnetic radiation are represented in waves. Each type of wave has a certain shape and length. The distance between two peaks in a wave is called the wavelength. It is indirectly related to the frequency which is the number of wave that pass per unit of time. Wavelength is equal to the speed of light divided by the frequency. We calculate as follows:

Wavelength = 300,000,000 m/sec / 650,000,000,000,000 per second
Wavelength = 4.62x10^-4 m

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3 years ago

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Are colavent bonds more likely to be found in compounds contaning both materals and nonmetals or compounds contaning only nonmet

atroni [7]

Answer:

bonds between 2 alike atoms or most non-metals get a covalent bond when reacting to the ... It tells what kinds of atomas are in a compound and how many.

Hope this helped

-Gavin

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3 years ago

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She sights two sailboats going due east from the tower. The angles of depression to the two boats are 42o and 29o. If the observ

Reika [66]

Answer:

The boats are 934.65 feet apart

Explanation:

Given:

The angles of depression to the two boats are 42 degrees and 29 degrees

Height of the observation deck i = 1,353 feet

To Find:

How far apart are the boats (y )= ?

Solution:

Step 1 : Finding the value of x(Refer the figure attached)

We can use the tangent ratio to find the x value

$tan(42^{\circ}) = \frac{1353}{x}$

$x = \frac{1353}{tan(42^{\circ}) }$

x = 590.47 feet

Step 2 : Finding the value of z (Refer the figure attached)

$tan(29^{\circ}) = \frac{1353}{z }$

$z = \frac{1353}{tan(29^{\circ})}$

z = 1525.12 feet

Step 3 : Finding the value of y (Refer the figure attached)

y = z -x

y = 1525.12 - 590.47

y = 934.65 feet

Thus the two boats are 934.65 feet apart

3 0

4 years ago

4. If the length of a cube is 2000 um calcula its volume

DochEvi [55]

multiply the six sides of the cube(LB), since length is 2000, then breadth will be 2000 also

4 0

3 years ago

luda_lava [24]

Answer:

500000N/m²

5250N

Explanation:

Given parameters:

Depth(H) = 50m

Density of water = 1000kg/m³

Acceleration of free fall = 10m/s

Unknown:

Pressure the water exerts on the diver = ?

Solution:

Pressure is the force per unit area on a body. In fluids, pressure is the product of density, gravity and height

Pressure in fluids = Density x acceleration due to gravity x height

Input the variables and solve;

Pressure in fluids = 1000 x 10 x 50 = 500000N/m²

width of window = 150mm

height of window = 70mm

Force water exerts on the window = ?

To solve this problem;

Pressure = $\frac{Force}{Area}$

Area of the window = width x height = 150 x 10⁻³ x 70 x 10⁻³

= 1.05 x 10 ⁻²m²

Force = pressure x area

Input the variables;

= 500000N/m² x 1.05 x 10 ⁻²m²

= 5250N

4 0

3 years ago