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Masja [62]
3 years ago
9

When a fork is placed in a hot piece of lasagna, thermal energy is transferred up the fork by...

Physics
2 answers:
erastovalidia [21]3 years ago
7 0
By conduction. Not convection this is air travel.
Gnom [1K]3 years ago
5 0
Because it's placed in the lasagna, the thermal energy is transferred by conduction. Remember, convection is transfer of heat through fluids (liquids and gases), and radiation is just transfer of heat through air. 
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A 100 kg individual consumes 1200 kcal of food energy a day. Calculate
IrinaK [193]

Answer:

(a) 5142.86 m

(b) 317.5 m/s

(c) 49.3 degree C

Explanation:

m = 100 kg, Q = 1200 kcal = 1200 x 1000 x 4.2 = 504 x 10^4 J

(a) Let the altitude be h

Q = m x g x h

504 x 10^4 = 100 x 9.8 x h

h = 5142.86 m

(b) Let v be the speed

Q = 1/2 m v^2

504 x 10^4 =  1/2 x 100 x v^2

v = 317.5 m/s

(c) The temperature of normal human body, T1 = 37 degree C

Let the final temperature is T2.

Q = m x c x (T2 - T1)

504 x 10^4 = 100 x 4.1 x 1000 x (T2 - 37)

T2 = 49.3 degree C

4 0
3 years ago
7. Copper can be coated on the surface of iron but not on silver? why​
Lisa [10]

Answer:

Silver has greater electronegativity (pull on electrons) than copper, so it will be reduced rather than oxidized. Silver ions will plate out on copper metal. Sir the coating of iron with copper surface can be referred as IRON-COPPER PLATING.

Explanation:

Iron is used for the electroplating of so copper because iron falls above copper in the electrochemical series whereas silver will fall off below the copper in electrochemical series that makes it not reliable for the electroplating purpose

4 0
3 years ago
American eels (Anguilla rostrata) are freshwater fish with long, slender bodies that we can treat as a uniform cylinder 1.0 m lo
madam [21]

Answer:

option D

Explanation:

given,

uniform length of cylinder = 1 m

diameter of the cylinder = 10 cm = 0.1 m

Eels have been recorded to spin = 14 rev/s

camera records at = 120 frames per second

time = \dfrac{1}{120}\ s/frame

angle at which eel rotate = ?

ω = 14 rev/s

ω = 14 x 2 π rad/s

ω = 28 π rad/s

angle at which eel rotate

 θ = ω t

θ = 28\pi\times \dfrac{1}{120}

θ = 0.733 rad

θ =0.733 \times \dfrac{180^0}{2\pi}

θ =42^0

Hence, the correct answer is option D

4 0
3 years ago
A 1500-kg sedan goes through a wide intersection traveling from north to south when it is hit by a 2200-kg SUV traveling from ea
astra-53 [7]

Answer:

Velocity of Sedan = 21 m/s

Velocity of SUV = 12 m/s

Explanation:

As we know that deceleration due to friction force is given as

a = - \mu g

so we have

a = -(0.75)(9.81)

a = -7.36 m/s^2

now the two cars comes to rest at a point which is at position of 5.39 m West and 6.43 m South

so net displacement of the car is given as

d = \sqrt{5.39^2 + 6.43^2}

d = 8.39 m

now the velocity of the two cars just after the impact is given as

v^2 - v_i^2 = 2a d

0 - v_i^2 = 2(-7.36)(8.39)

v_i = 11.11 m/s

direction of the motion is given as

tan\theta = \frac{6.43}{5.39}

\theta = 50 degree South of West

now we can use momentum conservation as there is no external force on it

Momentum conservation in North to south direction

m_1 v_1 = (m_1 + m_2) vsin\theta

1500 v_1 = (1500 + 2200) (11.11) sin50

v_1 = 21 m/s

Similarly momentum conservation towards West direction

m_2 v_2 = (m_1 + m_2) vsin\theta

2200 v_2 = (1500 + 2200) (11.11) cos50

v_2 = 12 m/s

5 0
3 years ago
25 points!
pentagon [3]

Answer:

6N

Explanation:

Given parameters:

Mass of object  = 6kg

Initial velocity  = 5m/s

Final velocity  = 25m/s

Time  = 30s

Unknown:

Net force acting on the object  = ?

Solution:

From Newton's second law of motion:

   Force  = mass x acceleration

Acceleration is the rate of change of velocity with time

  Acceleration  = \frac{Final velocity  - Initial velocity }{time}  

  Force  = mass x  \frac{Final velocity  - Initial velocity }{time}  

So;

 Force  = 6 x \frac{25  - 5}{30}    = 6N

3 0
3 years ago
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