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stealth61 [152]

2 years ago

10

Kevin was setting the table for thanksgiving dinner at his house. He had bought different set of knives spoons and forks from th

e kitchen how should Kevin arrange this cutlery on the table

1 answer:

Artist 52 [7]2 years ago

3 0

Answer:

es quebin

Explanation:

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A football player at practice pushes a 60 kg blocking sled across the field at a constant speed. The coefficient of kinetic fric

avanturin [10]

Answer:

C. 180 N

Explanation:

$m$ = mass of the blocking sled = 60 kg

$\mu$ = Coefficient of kinetic friction = 0.30

$f$ = kinetic frictional force acting on the sled

kinetic frictional force acting on the sled is given as

$f = \mu mg = (0.30) (60) (10) = 180 N$

$F$ =Force applied

For the sled to move at constant speed, the applied force must be same as the frictional force

$F = f\\F = 180 N$

6 0

3 years ago

An attacker at the base of a castle wall 3.95 m high throws a rock straight up with speed 5.00 m/s from a height of 1.60 m above

s344n2d4d5 [400]

Answer:

a) No

b) the rock must have a minimum initial speed of 6.79m/s for it to reach the top of the building.

Explanation:

Given:

Height of the wall = 3.95m

Initial height = 1.60m

Initial speed = 5.00m/s

distance between the initial height and wall top = 3.95 - 1.60 = 2.35m

Using the formula;

v^2 = u^2 + 2as ....1

Where v = final velocity, u = initial velocity, a = acceleration, s = distance travelled

From equation 1

s = (v^2 - u^2)/2a ...2

Since the rock t moving up,

the acceleration = -g = -9.8m/s2

s = maximum height travelled

v = 0 (at maximum height velocity is zero)

Substituting into equation 2

s = (0 - 5^2)/(2×-9.8) = 1.28m

Therefore, the maximum height is 1.28 from his initial height Which is less than the 2.35m of the wall from his initial height. So the rock will not reach the top of the wall

b) Using equation 1:

u^2 = v^2 - 2as

v = 0

a = -9.8m/s

s = 2.35m. (distance between the initial height and wall top)

u^2 = 0 - 2(-9.8 × 2.35)

u^2 = 46.06

u = √46.06

u = 6.79m/s

Therefore, the rock must have a minimum initial speed of 6.79m/s

8 0

3 years ago

Six moles of an ideal gas are in a cylinder fitted at one end with a movable piston. The initial temperature of the gas is 28.0

mel-nik [20]

Answer:

63.5 °C

Explanation:

The expression for the calculation of work done is shown below as:

$w=P\times \Delta V$

Where, P is the pressure

$\Delta V$ is the change in volume

Also,

Considering the ideal gas equation as:-

$PV=nRT$

where,

P is the pressure

V is the volume

n is the number of moles

T is the temperature

R is Gas constant having value = 8.314 J/ K mol

So,

$V=\frac{nRT}{P}$

Also, for change in volume at constant pressure, the above equation can be written as;-

$\Delta V=\frac{nR\times \Delta T}{P}$

So, putting in the expression of the work done, we get that:-

$w=P\times \frac{nR\times \Delta T}{P}=nR\times \Delta T$

Given, initial temperature = 28.0 °C

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15

So,

T₁ = (28.0 + 273.15) K = 301.15 K

W=1770 J

n = 6 moles

So,

$1770\ J=6 moles\times 8.314\ J/ Kmol \times (T_2-301.15\ K)$

Thus,

$T_2=301.15\ K+\frac{1770}{6\times 8.314}\ K$

$T_2=336.63\ K$

The temperature in Celsius = 336.63-273.15 °C = 63.5 °C

<u>The final temperature is:- 63.5 °C</u>

7 0

3 years ago

The measurement of 50m east is

Nostrana [21]

Answer:idk

Explanation:idk

6 0

3 years ago

The sketch below shows some of the insides of a stereo speaker. Running current through the wire, which is wrapped around the ba

VARVARA [1.3K]

Energy transformation, also termed as energy conversion, is the process of changing energy from one of its forms into another. In physics, energy is a quantity that provides the capacity to perform many works—think of lifting or warming an object. In addition to being convertible, energy is transferable to a different location or object, but it cannot be created or destroyed.

Energy in many of its forms may be used in natural processes, or to provide some service to society such as heating, refrigeration, lighting or performing mechanical work to operate machines. For example, in order to heat your home, your furnace can burn fuel, whose chemical potential energy is thus converted into thermal energy, which is then transferred to your home's air in order to raise its temperature.

In another example, an internal combustion engine burns gasoline to create pressure that pushes the pistons, thus performing work in order to accelerate your vehicle, ultimately converting the fuel's chemical energy to your vehicle's additional kinetic energy corresponding to its increase in speed.

Contents

1 Entropy and limitations in conversion of thermal energy to other types

2 Transformation of kinetic energy of charged particles to electric energy

3 History of energy transformation from the early universe

4 Examples

4.1 Examples of sets of energy conversions in machines

4.2 Other energy conversions

5 See also

6 References

3 0

3 years ago

Read 2 more answers