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3 years ago

A 60kg block is at rest on a ramp inclined at 35 degrees.

Physics

1 answer:

weeeeeb [17]3 years ago

8 0

Answer:

Explanation:

(a)Gravitational Force is W=mg

Frictional force is f

Normal force is N

(b)Since the block is in Equilibrium therefore from diagram we can see that

$f=mg\sin \theta$

$f=60\times 9.8\times \sin 35$

$f=337.26 N$

(c)Magnitude of Normal Force

$N=mg\cos \theta =481.66 N$

(d)friction is also given by

$f=\mu mg\cos \theta$

and $f=mg\sin \theta$

thus $tan \theta =\mu$

$\mu =0.7$

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o-na [289]

Answer:

See answer

Explanation:

Given quantities:

$\eta = 0.05\\ W=90[W]\\r=0.0285[m]$

where $\eta$ is the efficiency of the lightbulb (visible light is 5% of the total power), $W$ is the total power of the lightbulb, r is the radius of the lightbulb in meters.

Intensity is power divided by area:

$I =\frac{P}{A}$

a) Now the effective power is $\eta*W$ , therefore:

$I =\frac{\eta*W}{\pi r^2}=\frac{0.05*90}{4\pi (0.0285)^2}=440.87[W/m^2]$

b) Now the intensity is the average poynting vector is related to the magnitudes of the maximum electric field and magnetic field amplitudes, following:

$S_{average}= \frac{EB}{2\mu_{0}}[W/m]$

now $E$ and $B$ are related:

$E=cB\\ B=\frac{E}{c}$ and $c=\frac{1}{\sqrt{\epsilon_{0} \mu_{0}}}$

replace in $S_{average}$

$S_{average}=I= \frac{c \epsilon_{0}E^2}{2}[W/m]$

we replace the values and we get:

$E= \sqrt{\frac{2I}{\epsilon_{0}c}}$

$E = \sqrt{\frac{2(440.8)}{8.85*10^{-12}3*10^8}}=576.24[V/m]$

therefore

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3 years ago

A downhill skier was able to move 560 meters in 25 seconds. What is the skier’s average speed? (Round your answer to the nearest

slava [35]

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3 years ago

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Use the paragraph to complete the activity.

Lostsunrise [7]

Explanation:

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The specific gravity of an material is defined as the ratio of the density of the material to the density of water. The specific

Alexandra [31]

The percentage of the iceberg that is visible above the water's surface will be 11.5%.

<h3>What is density?</h3>

Density is defined as the mass per unit volume. It is an important parameter in order to understand the fluid and its properties. Its unit is kg/m³.

The mass and density relation is given as

mass = density × volume

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The ratio by which the iceberg submerge is found as;

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Hence, the percentage of the iceberg that is visible above the water's surface will be 11.5%.

To learn more about the density refers to the link;

brainly.com/question/952755

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