What are two factors that determine the thermal energy of a substance

A ball A is thrown vertically upward from the top of a 24-m-high building with an initial velocity of 7 m/s . At the same instan

solniwko [45]

Answer:

The height from ground at which they pass each other is 22.656 m

The time at which they pass each other is 1.6 sec.

Explanation:

For ball A, we have:

height = (h)a

Initial Velocity = Vi = 7 m/s

g = - 9.8 m/s² (for upward motion)

Using 2nd eqn. of motion:

h = Vi t + (1/2)gt²

(h)a = 7t + (1/2)(-9.8)t²

(h)a = 7t - 4.9t²

this is the height of ball A with reference as the building. Taking ground as reference, we have to add the height of building, that is, 24 m.

(h)a = 7t - 4.9t² + 24 ______ eqn (1)

For ball B, we have:

height = (h)b

Initial Velocity = Vi = 22 m/s

g = - 9.8 m/s² (for upward motion)

Using 2nd eqn. of motion:

h = Vi t + (1/2)gt²

(h)b = 22t + (1/2)(-9.8)t²

(h)b = 22t - 4.9t² ______ eqn (2)

Now, when the too balls pass each other, there height must be same.

Therefore,

(h)a = (h)b

using eqn (1) and eqn (2):

7t - 4.9t² + 24 = 22t - 4.9t²

22t - 7t = 24

t = 24/15

t = 1.6 sec

Now, for the height, at which they pass each other put t = 6sec in eqn (2)

Therefore,

h = (22)(1.6) - (4.9)(1.6)²

h = 35.2 - 12.544

h = 22.656 m

6 0

4 years ago

Two plates are separated by a 1/4 in space. The lower plate is stationary; the upper plate moves at 10 ft/s. Oil (viscosity of 2

Montano1993 [528]

Answer:

τ = 0.25 lbf/in²

Explanation:

given that the oil viscosity, μ = 2.415 lb/ft-s

gap between plates = 1/4 inches = 1/4*12 = 1/48 ft

recall from newtons law of viscosity;

shear stress τ = μ du/dy =

τ = (2.415 lb/ft-s) (10 ft/s)/(1/48) ft

τ = 1159.2 lb/ft-s²

we know that, 1 slug = 32.174 lb

lb = 1/32.174 slug

∴ τ = 1159.2/32.174 slug/ft-s² = 36 slug/ft-s²

τ = 36 slug/ft-s²

multiply both the numerator and denominator by ft, this gives

τ = 36 slug-ft/ft²-s²

τ = 36 lbf/ft² where 1 slug-ft/s² = 1lbf

since 1 ft = 12 inch = 1 ft² = 12² in² = 144 in²

∴ τ = 36/144 lbf /in² = 0.25 lbf/in²

τ = 0.25 lbf/in²

6 0

3 years ago

Explain why slopping roofs are used in areas with heavy rain or snow fall

Savatey [412]

Answer:

Slopping or slanting roofs are found in houses where there are snow or rain, because it helps the water or the snow to skid down easily. It minimizes the chances of waterlogging because water cannot rest on the roof surface for long.

Explanation:

Brainliest pls.

8 0

3 years ago

A cold storage room is used to keep the temperature inside the room maintain at low temperature.

lianna [129]

Answer:

The power of the brick wall it may be how the soiled ness of the wall too keep in the cold

Explanation:

5 0

3 years ago

Read 2 more answers

4.In a hydroelectric power plant, 100 m3/s of water flows from an elevation of 120 m to a turbine, where electric power is gener

Dmitrij [34]

Answer:

The rate of irreversible loss will be "55.22 MW".

Explanation:

The given values are:

Elevation,

h = 120 m

Flow of water,

Q = 100 m³/s

Efficiency,

= 80%

i.e,

= 0.8

Efficiency turbine,

= 50 MW

Now,

Without any loss,

The power generated by turbine will be:

⇒ $P=\delta gQh$

On substituting the values, we get

⇒ $=1000\times 9.8\times 100\times 120$

⇒ $=117.72 \ MW$

Power generated in actual will be:

= $\frac{50}{0.8}$

= $62.5 \ MW$

Hence,

Throughout the piping system,

The rate of irreversible loss is:

= $Power \ generated \ by \ turbine-Power \ generated \ in \ actual$

= $117.72-62.5$

= $55.22 \ MW$

4 0

3 years ago