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3 years ago

Describe how all the air in the oven becomes hot?

Physics

1 answer:

vladimir1956 [14]3 years ago

4 0

I think through convection I forget. Plus its enclosed (and, well closed)

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An 8.5 kg crate is pulled 5.1 m up a 30 degree incline by a rope angled 17 degrees above the incline. The tension in the rope is

Ulleksa [173]

Answer:

1. a $W_t=746.63 J$

b $E_p=212.415 J$

c $W_n=183.96J$

2. $T_e=99.71J$

Explanation:

a). The work done by the tension is:

$W_t=T*dt$

$dt=\frac{5.1}{cos(17)}$

$W_t=140N*\frac{5.1}{cos(17)}$

$W_t=746.63 J$

b). The work done potential of gravity

$E_p=m*g*h$

$h=5.1*sin(17)$

$E_p=8.5kh*9.8*5.1*sin(30)$

$E_p=212.415 J$

c). The work done by the normal force

$W_n=N*d_n$

$d_n=5.1*sin(30)=2.55$

$W_n=8.5kg*9.8*cos(30)*2.55$

$W_n=183.96J$

2. The increase in thermal energy is:

$T_e=F*d$

$F_k=u_k*m*g=0.271*8.5kg*9.8*cos(30)$

$F_k=19.5N$

$T_e=19.55*5.1m$

$T_e=99.71J$

4 0

3 years ago

5 points

olga2289 [7]

Answer:

d. 5 ohms

Explanation:

For resistors in parallel, the equivalent resistance is found with:

1/Req = ∑(1/R)

1/R = 1/15 + 1/15 + 1/15

1/R = 3/15

R = 15/3

R = 5

8 0

3 years ago

a lost puppy of 5 kg is 25 m away from his owner of 90 kg. What is the gravitional attraction between the two

Fudgin [204]

The gravitational attraction 50 m

5 0

3 years ago

Read 2 more answers

Becky is a 4-month-old infant whose mother uses a high-pitched voice, simple words or phrases, and lots of repetition when she s

hichkok12 [17]

Answer:

child-directed speech

Explanation:

child-directed speech is Any of various speech patterns used by parents or caregivers when communicating with young children

5 0

3 years ago

A solid cylinder and a hollow cylinder of equal mass and radius are at rest at the top of an inclined plane. They are released s

andrezito [222]

Answer:

Solid cylinder

Explanation:

Solid cylinder will reach first

If radius of each cylinder is r

mass is m

then,

Moment of inertia I= dm $r^{2}$

Here d = measure as how close the mass is to the edge

Velocity of rolling cylinder is given by

v= $\sqrt} \frac{2gh}{1+d}$

where,

g= 9.8 m/s2

h= height from ground

So from formula of velocity we can say that velocity will be maximum if denominator is minimum i-e if k is of small value -- or in other word if mass is away from edge i-e if mass is closer to the center !

As all the mass in hollow cylinder is near the edge so k value will be higher for it and hence it will have low velocity value. So it will reach later as compared to the solid cylinder in which mass is closer to the center and hence k is greater for solid cylinder.

6 0

3 years ago