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Assoli18 [71]
2 years ago
13

A solid wooden cube, 30cm on each side can be totally submerged in water if it is pushed downward with a force of 54N. What is t

he density of the wood?
Physics
1 answer:
Stels [109]2 years ago
4 0

Answer:

the density of the wooden cube is 204.1 kg/m³

Explanation:

Given;

applied force, F = 54 N

length of each side of the solid wooden cube, L = 30 cm = 0.3 m

mass of the wooden cube is calculated as;

F = mg

m = F/g

m = 54/9.8

m = 5.51 kg

The volume of the wooden cube is calculated as;

V = L³

V = (0.3)³

V = 0.027 m³

The density of the wooden cube is calculated as;

ρ = m/V

ρ = (5.51 kg) / (0.027 m³)

ρ = 204.1 kg/m³

Therefore, the density of the wooden cube is 204.1 kg/m³

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Answer:

adaptive optics

Explanation:

simple

3 0
2 years ago
The two conducting rails in the drawing are tilted upwards so they each make an angle of 30.0° with respect to the ground. The v
dolphi86 [110]

Answer:

The current flows through the rod is 14.9 A.

Explanation:

Given that,

Magnetic field = 0.045 T

Mass of aluminum rod  = 0.19 kg

Length = 1.6 m

Angle = 30.0°

We need to calculate the force

Using resolving force

F\cos\theta=mg\sin\theta

F=mg\tan\theta

Put the value into the formula

F=0.19\times9.8\times\tan30

F=1.075\ N

We need to calculate the current flows through the rod

Using formula of magnetic force

F=iLB

i=\dfrac{F}{LB}

Put the value into the formula

i=\dfrac{1.075}{1.6\times0.045}

i=14.9\ A

Hence, The current flows through the rod is 14.9 A.

8 0
3 years ago
A student standing on the ground throws a ball straight up. The ball leaves the student's hand with a speed of 16.0 when the han
slava [35]

There are mistakes in the question as the unit of speed and height is not mention here.The correct question is here

A student standing on the ground throws a ball straight up. The ball leaves the student's hand with a speed of 16.0m/s when the hand is 1.80m above the ground.How long is the ball in the air before it hits the ground? (The student moves her hand out of the way.)

Answer:

t=3.37s

Explanation:

Given Data

As we have taken hand at origin and positive upward

So given data are

y_{i}=0m\\y_{f}=-1.80m\\v_{i}=16.0m/s\\a=g=9.8m/s^{2}

To find

time taken by the ball before it hits the ground

Solution

By using the common kinematic equation

y_{f}=y_{i}+v_{i}t+0.5at^{2}

Put the given values and find for t

So

-1.80=0+16.0t+(0.5*(-9.8)t^{2} )\\-1.80=16.0t-4.9t^{2}\\ 4.9t^{2}-16.0t-1.80=0

Apply quadratic formula to solve for t

t=\frac{-(-16.0)+\sqrt{(-16)^{2}+4(4.9)(-1.80)} }{2(4.9)}\\ t=3.37s

4 0
3 years ago
A raindrop has a mass of 5.4 × 10-7 kg and is falling near the surface of the earth. Calculate the magnitude of the gravitationa
Xelga [282]

Answer

given,

mass of raindrop = 5.4 × 10⁻⁷ kg

acceleration due to gravity = 9.8 m/s²

a) magnitude of gravitational force on the rain drop

   Force on the rain drop = m g

   Force on the rain drop = 5.4 × 10⁻⁷ x  9.8

                                          = 5.292 x 10⁻⁶ N

Hence, force on raindrop by earth is equal to 5.292 x 10⁻⁶ N

b) by newtons third law

    Force by the earth on the raindrop will be opposite to the force by raindrop on earth.

Force on earth by raindrop = - 5.292 x 10⁻⁶ N

  negative sign represent that force is acting in the opposite direction.

     

4 0
2 years ago
Read 2 more answers
Irina finds an unlabeled box of fine needles, and wants to determine how thick they are. A standard ruler will not do the job, a
77julia77 [94]

Answer:

Explanation:

y1 = 16.2/2 = 8.1 cm

d = 1.22 lambda D/y1

d = 1.22 x 657 x 10^-9 x 23.7/0.081

d = 2.35 x 10^-4 m = 234.52 um

6 0
3 years ago
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