6. State whether each of the following is an example of conduction, convection, and/or radiation. Explain if you think there is more than one possibility. (a)You are cooking, and the handle of the spoon you are using to stir the soup starts to feel hot.

(b)A pail of hot water is added to a child’s inflatable pool. After a while, the pool is warm.

(c)You go to the park, and when you sit on a metal bench, it is hot.

(d)You are standing near a barbecue, and you feel the heat on your face.

Answers

Answer 1

Answer: a). Convection is heating the soup in the pot.
When you stick the spoon into the hot soup,
conduction heats the spoon all the way up to the end.

b). Water conducts heat a little bit.
But convection is much more responsible for the
uniform distribution of temperature in the kiddie pool.

c). The heat from the metal bench conducts directly
to the buttus epidermis when you sit on it.

d). You feel the heat on your face ... but not on the back of your
neck ... on account of radiation from the fire and the hot grill.

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The main reason ice blocks became unpopular for cooling food was
According to “The Cyclone,” who invented the Fourth of July?A. Pecos Bill B. Alexander Hamilton C. Sam Houston D. George Washington
Which of the following statements is an accurate description of vibrations? A. The frequency of infrasonic vibrations is much too high to be heard by humans. B. Neither ultrasonic nor infrasonic vibrations can be heard by humans. C. Infrasonic vibrations are used in sonar equipment as well as to detect flaws in steel castings. D. Ultrasonic vibrations have a frequency lower than the range for normal hearing.
A car leaves the pit after a refueling stop and accelerates uniformly to a speed of 62.2 m/s in 5.0 s to rejoin the race. What is the car's acceleration during this time?
Two objects are connected by a light string that passes over a frictionless pulley as shown in the figure below. Assume the incline is frictionless and take m1 = 2.00 kg, m2 = 7.35 kg, and θ = 50.0°.1) Find the magnitude of the accelerations of the objects. (m/s^2) 2)Find the tension in the string. (N) 3)Find the speed of each object 2.50 s after being released from rest. (m/s)

How much energy is contained in the mass of a 60-kilogram person?

Answers

I could tell you the energy if you can tell me the acceleration and height above earth's surface.

the energy in the body depends on the work that had done and the type of food he she had if it is in a 60 kg person / 40 kg person.

Your physics teacher is giving you a special gift a box of mass 20 kg with a mystery surpise insie .the box is placed on a frictionsed table .what is the weigth of the box and normal reaction over it by the table ?

Answers

Answer:

F = 196.2 N

Explanation:

Use Newtons law

F = m * a

F = 20 kg * 9.81 m/s²

F = 196.2 N

Answer:

$\Huge \boxed{\mathrm{196.2 \ N}}$

$\rule[225]{225}{2}$

Explanation:

Using weight formula:

$\sf Weight = mass * acceleration \ of \ gravity$

$W=mg$

The mass of the box is 20 kg.

The acceleration of gravity on Earth is 9.81 m/s².

$W=(20)(9.81)$

$W=196.2$

The weight of the box is 196.2 N.

The net force of the box is zero, since the box is at rest. The normal force is exerted upward on it by the table.

$\rule[225]{225}{2}$

The eye of the Atlantic giant squid has a diameter of 3.50 × 10^2 mm. If the eyeis viewed in a concave mirror with a radius of curvature equal to the diameter
of the eye and the eye is 0.800 × 10^3 mm from the mirror, how far is the image
from the mirror? What is the size of the image? Is the image real or virtual?

Answers

Answer:

q = 224 mm, h ’= - 98 mm, real imagen

Explanation:

For this exercise let's use the constructor equation

$(1)/(f) = (1)/(p) + (1)/(q)$

where f is the focal length, p and q are the distance to the object and the image respectively.

In a mirror the focal length is

f = R / 2

indicate us radius of curvature is equal to the diameter of the eye

R = 3,50 10² mm

f = 3.50 10² /2 = 1.75 10² mm

they also say that the distance to the object is p = 0.800 10³ mm

1 / q = 1 / f - 1 / p

1 / q = 1 / 175 - 1 /800

1 / q = 0.004464

q = 224 mm

to calculate the size let's use the magnification ratio

m = $(h')/(h) = - (q)/(p)$

h '= $- (q)/(p) \ h$

h ’= - 224 350 / 800

h ’= - 98 mm

in concave mirrors the image is real.

A doctor diagnoses a man with an acute strain. Which job is most likely to cause an acute strain?

Answers

Answer:

A bricklaying job

Explanation:

To start with an acute strain is a type of inury that occurs when heavy objects are improperly lifted an individual in ways that the person's muscles becomes overstressed.

There are a number of jobs that are likely to cause acute strain including bricklaying jobs. People engaged in bricklaying jobs tend to improperly lift heavy objects, an activity that leads to repititive and prolonged overuse of muscles and tendons which is known as acute strain.

Another example of a job that can lead to acute strain is furniture moving.

What influences the Earth's tides and climate?A. Moon
B. Mars
C. the Milky Way
D. Venus

Answers

The moon influences the Earth's tides.

None of the items on this list of choices influences the seasons.

the moon influences the tides and climate

Water, with a density of rho = 1145 kg/m 3 , flows in a horizontal pipe. In one segment of the pipe, the flow speed is v 1 = 7.33 m/s . In a second segment, the flow speed is v 2 = 1.57 m/s . What is the difference between the pressure in the second segment ( P 2 ) and the pressure in the first segment ( P 1 )?