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3 years ago

PLEASE HELP TOPIC - CONVECTION

Physics

1 answer:

Alex777 [14]3 years ago

6 0

Answer:

Dry air burns out and gets warm
It's smoke and smoke always rises
Not ours
It makes sure no air is inside bc air gets cold an freezes

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10.<br> Name THREE conductors and insulators with examples from everyday use.

Anna35 [415]

Answer:

Explanation:

Some common conductors are copper, aluminum, gold, and silver. Some common insulators are glass, air, plastic, rubber, and wood.

7 0

3 years ago

(b) A piece of wood of volume 0.6 m² floats in water. Find the volume

enot [183]

Answer:

Explanation:

Let the volume below water be v . Then

buoyant force = v d g where d is density of water , g is acceleration due to gravity

= v x 1000 x g

weight of wood piece = volume x density of wood x g

= .6 x 600 x g

for equilibrium while floating

buoyant force = weight

= v x 1000 x g = .6 x 600 x g

v = .36 m²

volume above water or volume exposed = .6 - .36

= .24 m²

When immersed completely ,

buoyant force = .6 x 1000 x 9.8

= 5880 N

weight of wood

= .6 x 600 x g

= 3528 N

buoyant force is more than the weight . In order to equalise them for floating with full volume in water

weight required = 5880 - 3528

= 2352 N.

6 0

3 years ago

Ann puts a beaker on the scale which shows the mass to be 1.65kg. The actual mass was 1.72 kg. what was the percent error in Ann

mojhsa [17]

Measured reading is 1.65 kg

actual reading was 1.72 kg

error in the reading is 1.72 - 1.65 = 0.07 kg

Now percentage error is given as

$error = \frac{error}{true reading}*100$

$error = \frac{0.07}{1.72}*100$

$error = 4.1$

<em>so this is -4.1% error as the measured reading is less than the actual value</em>

8 0

3 years ago

what aspect of receiver analog-to-digital conversion determines the maximum receive bandwidth of a direct digital conversion sdr

Zepler [3.9K]

Answer:

The sample rate determines the maximum receive bandwidth of a direct digital conversion SDR. An analog signal must be sampled at twice the rate of the highest frequency component of the signal by an analog-to-digital converter so that the signal can be accurately reproduced.

Explanation:

8 0

2 years ago

A cannon fires a cannonball of mass 16.0 kg by applying a force of 2750 N along the 1.25 m length of the barrel. (a) How much wo

Zarrin [17]

To develop this problem it is necessary to apply the concepts related to Work and energy conservation.

By definition we know that the work done by a particle is subject to the force and distance traveled. That is to say,

$W = F*d$

Where,

F= Force

d = Distance

On the other hand we know that the potential energy of a body is given based on height and weight, that is

$PE = -mgh$

The total work done would be given by the conservation and sum of these energies, that is to say

$W_{net} = W+PE$

PART A) Applying the work formula,

$W = F*d\\W = 2750*1.25\\W = 3437.5J$

PART B) Applying the height equation and considering that there is an angle in the distance of 25 degrees and the component we are interested in is the vertical, then

$PE = -mgh*sin25$