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3 years ago

U guys are the best I’m surprised I’m getting all of this right

Physics

2 answers:

Phantasy [73]3 years ago

6 0

Answer:

B. 1/4

Explanation:

The cake is 1 whole or 4/4 total. If 3 people ate 1/4 then 3/4 of the cake was eaten. so.... it leaves 1/4 left.

ella [17]3 years ago

5 0

The answer is B, 1/4 of the cake

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For a standing wave to form in a medium, two waves must

Slav-nsk [51]

For a standing wave to form, two waves must be traveling in opposite directions and cause destructive interference.

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3 years ago

A 3.0-kg block starts at rest at the top of a 37° incline, which is 5.0 m long. Its speed when it reaches the bottom is 2.0 m/s.

Mama L [17]

Answer: $f_{r}$ = 16.49N

Explanation: The object is placed on an inclined plane at an angle of 37° thus making it weight have two component,

$W_{x}$ = horizontal component of the weight = mgsinФ

$W_{y}$ = vertical component of weight = mgcosФ

Due to the way the object is positioned, the horizontal component of force will accelerate the object thus acting as an applied force.

by using newton's law of motion, we have that

mgsinФ - $f_{r}$ = ma

where m = mass of object=5kg

a = acceleration= unknown

Ф = angle of inclination = 37°

g = acceleration due to gravity = 9.8 $m/s^{2}$

$f_{r}$ = frictional force = unknown

we need to first get the acceleration before the frictional force which is gotten by using the equation below

$v^{2} = u^{2} + 2aS$

where v = final velocity = 2m/s

u = initial velocity = 0m/s (because the object started from rest)

a= unknown

S= distance covered = length of plane = 5m

$2^{2} = 0^{2} + 2*a*5\\\\4= 10 *a\\\\a = \frac{4}{10} \\a = 0.4m/s^{2}$

we slot in a into the equation below to get frictional force

mgsinФ - $f_{r}$ = ma

3 * 9.8 * sin 37 - $f_{r}$ = 3* 0.4

17.9633 - $f_{r}$ = 1.2

$f_{r}$ = 17.9633 - 1.2

$f_{r}$ = 16.49N

4 0

4 years ago

Which element has a magnetic properties

vodomira [7]

Answer:

Since then only three elements on the periodic table have been found to be ferromagnetic at room temperature - iron (Fe), cobalt (Co), and nickel (Ni). The rare earth element gadolinium (Gd) nearly misses by only 8 degrees Celsius.

Explanation:

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3 years ago

Read 2 more answers

A solid conducting sphere has net positive charge and radius r = 0.800 m . At a point 1.20 m from the center of the sphere, the

Serga [27]

here we have to calculate the net positive charge present on he surface of the conducting sphere.

as the sphere is a conducting one the,the charge will be stored on its surface.

though the charge is present at the surface,still it will behave just like the total charge is concentrated at the centre of the sphere.

the electric field at outside of the sphere is E= $\frac{1}{4\pi\epsilon} \frac{q}{r^2}$

as E= $\frac{-dv}{dr}$

so V= $\frac{1}{4\pi\epsilon} \frac{q}{r}$

here V=27 volt,radius of sphere is 0.800 m and the point at which the potential is considered is at 1.20 m from th centre of the sphere.hence the point is at the outside of the sphere .

hence we have 27= $\frac{1}{4\pi\epsilon} \frac{q}{1.20}$