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stellarik [79]
3 years ago
6

Find the force, in Newtons, on a rectangular metal plate with dimensions of 4 m by 8 m that is submerged horizontally in 9 m of

water. Water density is 1000 kg/m3 and acceleration due to gravity is 9.8 m/s2. If necessary, round your answer to the nearest Newton.
Physics
1 answer:
Irina18 [472]3 years ago
4 0

Answer:

F \approx 3*10^6

Explanation:

From the question we are told that:

Dimension of plate: 4 m by 8 m

Depth submerged d=9m

Water density \rho=1000 kg/m3

Gravity g=9.8m/s^2

Generally the equation for Volume is mathematically given by

 V=L*B*d

 V=4*8*9

 V=288

Therefore The mass of Plate is

 m=\rho*V

 m=1000*288

 m=288000kg

Generally the equation for Force on the plate is mathematically given by

F=ma

 F=288000*9.8

 F=2822400N

 F=2.8*10^6

 F \approx 3*10^6

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You decide to travel by car for your holiday visits this year. You leave early in the morning to avoid congestion on the roads.
Bond [772]

Answer:

d_t=266.918\ miles is the total distance of the trip travelled.

s_{avg}=54.7895\ mph is the average speed of the journey

Explanation:

Given:

  • duration of first interval, t_1=3.22\ hr
  • speed during the first interval, v_1=65.9\ mph
  • duration of stoppage, t_0=42.1\ min=0.7017\ hr
  • duration of second interval, t_2=0.95\ hr
  • speed during second interval, v_2=57.6\ mph

<u>Now the total distance travelled:</u>

\rm distance=speed\times time

d_t=v_2.t_2+v_1.t_1

d_t=57.6\times 0.95+65.9\times 3.22

d_t=266.918\ miles

<u>The average speed:</u>

\rm speed_{avg}=\frac{total\ distance}{total\ time\ taken}

s_{avg}=\frac{d_t}{(t_0+t_1+t_2)}

s_{avg}=\frac{266.918}{(0.7017+3.22+0.95)}

s_{avg}=54.7895\ mph

4 0
4 years ago
A ball is tossed upwards into the air with an initial upwards velocity of 3.0m/s. What is the ball's velocity when it returns to
krek1111 [17]
  • Same as initial velocity.
  • Acceleration due to gravity is 9.8m/s^2

Which is constant on the whole way of travel of the ball.

As no change in acceleration there is no change in velocity at end and it remains at 3m/s

7 0
3 years ago
Mass of glass is more than the mass of wood. If volume of glass and wood is same then, a. Glass is denser than wood b. Wood is d
viktelen [127]

Answer:

a. Glass is denser than wood.

Explanation:

Density=Mass/volume

In this case we know that mass of glass is greater than wood. And the volume of both glass and wood are the same, so we will ignore that factor. Since mass is directly proportional to density, if your mass increase, your density increases as well, in this case.

5 0
4 years ago
Glass absorbs ultraviolet (UV) rays from the Sun. Would a fraction of the incident UV light be reflected from the air/glass boun
fiasKO [112]

Answer:

Yes

Explanation:

Any transparent surface in practical is neither a perfect absorber of electromagnetic waves neither a perfect reflector. Generally all the transparent surfaces reflect some amount of irradiation and the other parts are absorbed and transmitted.

<u>That is given by as relation:</u>

\alpha+\rho+\tau=1

where:

\alpha= absorptivity which is defined as the ratio of the absorbed radiation to the total irradiation

\rho= reflectivity is defined as the ratio of reflected radiation to the total irradiation

\tau= transmittivity is defined as the ratio of total transmitted radiation to the total irradiation

6 0
4 years ago
A very light ideal spring having a spring constant (force constant) of 8.2 N/cm is used to lift a 2.2-kg tool with an upward acc
vampirchik [111]

Answer:

x = 3.5 cm

Explanation:

When spring is used as a lift tool

so the mass suspended on it will have spring force on it

So as per the force equation of mass we can say

F_{net} = ma

now net force on the mass is

F_{net} = kx - mg

F_{net} = kx - mg = ma

here we have

kx = mg + ma

now we have

x = \frac{mg + ma}{k}

x = \frac{2.2(9.8) + 2.2(3.25)}{8.2}

x = 3.5 cm

6 0
4 years ago
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