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3 years ago

The chimney of an oil lamp cracks when touched with rhe brade of cold knife?why

Physics

2 answers:

Bezzdna [24]3 years ago

7 0

Answer:

The extreme difference between the hot chimney and the cold knife makes the chimney expand and contract so quickly it cracks.

Explanation:

Hope this helped!

Fiesta28 [93]3 years ago

6 0

Answer:

When a blade of cold knife is touched to hot glass chimney there is a sudden drop of temperature on the spot where the blade touches. As a result it cracks.

Explanation:

When a blade of cold knife is touched to hot glass chimney there is a sudden drop of temperature on the spot where the blade touches. This decrease in temperature makes the glass to contract. The stress developed on the site of contraction is responsible for the cracking of the glass chimney.

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Four vehicles approach an intersection with a 4 way stop at the same time. Car B is ahead of Car A and both are in the same lane

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3 years ago

Please need help fast

iVinArrow [24]

(a) See graph in attachment

The appropriate graph to draw in this part is a graph of velocity vs time.

In this problem, we have a horse that accelerates from 0 m/s to 15 m/s in 10 s.

Assuming the acceleration of the horse is uniform, it means that the velocity (y-coordinate of the graph) must increase linearly with the time: therefore, the velocity-time graph will appear as a straight line, having the final point at

t = 10 s

v = 15 m/s

(b) $1.5 m/s^2$

The average acceleration of the horse can be calculated as:

$a=\frac{v-u}{t}$

where

v is the final velocity

u is the initial velocity

t is the time interval

In this problem,

u = 0

v = 15 m/s

t = 10 s

Substituting,

$a=\frac{15-0}{10}=1.5 m/s^2$

(c) 75 m

For a uniformly accelerated motion, the distance travelled can be calculated by using the suvat equation:

$s=ut+\frac{1}{2}at^2$

where

s is the distance travelled

u is the initial velocity

t is the time interval

a is the acceleration

In this problem,

u = 0

t = 10 s

$a=1.5 m/s^2$

Substituting,

$s=0+\frac{1}{2}(1.5)(10)^2=75 m$

(d) See attached graphs

In a uniformly accelerated motion:

- The distance travelled (x) follows the equation mentioned in part c,

$x=ut+\frac{1}{2}at^2$

So, we see that this has the form of a parabola: therefore, the graph x vs t will represents a parabola.

- The acceleration is constant during the motion, and its value is

$a=1.5 m/s^2$ (calculated in part b)

therefore, the graph acceleration vs time will show a flat line at a constant value of 1.5 m/s^2.

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3 years ago

Place the single slit wheel on the optics bench and turn the wheel to the variable slit width Slowly turn the wheel and observe

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Answer:

With the equation:

sin T = l / a (*)

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Explanation:

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4 years ago

A machine in an ice factory is capable of exerting 3.00x10^2 N of force to pull a large block of ice up a slope. The block weigh

aivan3 [116]

Answer:

1.41 °

Explanation:

From machine,

The formula for the efficiency of machine is

E(%) = (M.A/V.R)×100................. Equation 1

Where E(%) = Percentage Efficiency of the machine, M.A = Mechanical Advantage of the machine, V.R = Velocity ratio of the machine.

Note: A slope forms an an inclined plane with the horizontal

Make V.R the subject of the equation

V.R = 100M.R/E(%)................. Equation 2

But,

M.A = L/E......................... Equation 3

Where Load, E = Effort.

Given: E = 3.00×10² N, L = 1.22×10⁴ N

Substitute into equation 3

M.A = 1.22×10⁴ / 3.00×10²

M.A = 40.7.

Note: Assuming no friction means that the efficiency of the inclined plane(slope) = 100 %

Hence, E(%) = 100 %

Substitute into equation 2

V.R = 100(40.7)/100

V.R = 40.7.

The velocity of an inclined plane is

V.R = 1/sin∅........................... Equation 4

Where ∅ = maximum angle that the slope makes with the horizontal.

make ∅ the subject of the equation

∅ = sin⁻¹(1/V.R)................... Equation 5

Substitute the value of V.R into equation 5

∅ = sin⁻¹(1/40.7)

∅ = sin⁻¹(0.0246)

∅ = 1.41 °

5 0

4 years ago

Read 2 more answers

The chimney of an oil lamp cracks when touched with rhe brade of cold knife?why​

The chimney of an oil lamp cracks when touched with rhe brade of cold knife?why