PHYSICS MIDDLE SCHOOL

Imagine you poor some hot soup into a bowl. You place your hands on the outside of the bowl and feel that the bowl is very warm. How did that heat get from the soup bowl through your hands?A Osmosis
B Radiation
C Conduction
D Convection

Answers

Answer 1
Answer: May be The answer is Conduction
Answer 2
Answer: the answer  is c conduction

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if you use the compound pulley, you will need to pull twice the distance but with less force. the force you need is equal to one half the weight of the box plus 25 N. what is the force needed?

Answers

Answer:

F= 25/2 = 12.5N

Explanation:

When you use a compound pulley the force required depends on the mechanical advantage of the compound pulley. This is known as rate of loss of distance or the ratio of the force to the load.

M.A = Effort distance /Load distance. OR M.A = Load/Effort

Answer my question plzz !!
any body

Answers

Answer:

The height is 80 meters.

Explanation:

The equation for the distance in the second segment of the fall is as below. In it, we use the initial velocity v1 that the ball had after completing the first segment. From this equation, v1 can be determined:

h_2 = (1)/(2)gt_2^2+v_1t_2=0.5\cdot 10(m)/(s^2)\cdot 4 s^2+v_1\cdot 2 s=60m\implies\nv_1 = 20(m)/(s)

Next, we use the kinematic equation for velocity at the end of the first segment of a free fall, to determine h1:

v_1^2 = 2gh_1+v_0^2 = 2gh_1\implies h_1 = (v_1^2)/(2g)=20m

The total height is then

h = h_1 + h_2 = 20m + 60 m = 80m

true or false the speed of sound traveling through steel is much less than the speed of sound traveling through air

Answers

This is false. Sound travels faster through steel. That is why you can see people in movies putting their ear on the railroads to see whether a train is coming. That is because they can't hear it through air, but the sound travels through the steel.
True because steel is much heavier and will make the sound travel through it slower

Why do scientists think Mars once had liquid water on the surface?Please help!!!!!!!!!!!!!!!!!

(Homework due tomorrow!!!)

Answers

scientists this this as mars contains polar ice caps
and so that ice must have come from somewhere 

A curve has a radius of 50 meters and is banked 5 degrees. The road is covered with ice and is frictionless. What is the maximum speed, in mph, a car can travel and negotiate the curve? A.) 15.65mph B.) 25.00mph C.)65.00mph D.) 6.55mph E.) None of the above

Answers

Answer:

E.) None of the above

Explanation:

Draw a free body diagram.  There are two forces acting on the car.  Normal force perpendicular to the road, and weight downward.

Sum of the forces perpendicular to the road:

∑F = ma

N − mg cos θ = 0

N = mg cos θ

Sum of the forces towards the center of the circle:

∑F = ma

N sin θ = mv²/r

mg cos θ sin θ = mv²/r

g cos θ sin θ = v²/r

v = √(gr cos θ sin θ)

Given r = 50 m and θ = 5°:

v = √(9.8 m/s² × 50 m × cos 5° × sin 5°)

v = 6.52 m/s

v = 14.6 mph

As the polar ice caps melted and the sea level rose more than 300 feet above present day levels. A sharp drop-off that was left behind by this ancient shoreline can now be seen. This sharp drop-off called a ___________________is typically visible when crossed by a river because often there will be rapids or waterfalls. A) Fall Line B) Sand Hills C) Coastal Plain D) Barrier Islands

Answers

Answer:

Option A) Fall Line

Explanation:

A fall line is a geological boundary that is formed between an upland region and a plain beneath. Usually, the regions are identified by falls or rapids when rivers and streams cross or meet.

One interesting feature is that the fall lines are formed when rivers meander through regions of weak rock structure. Normally, the rock structure is sedimentary rock structure (layered). The rivers tear into the earth by erosion, abrasion and attrition.

In addition, plate tectonics play an important role. The movement of the earth's plates causes the falls. Some are formed by the rapid freeze-thawing action of large blocks of ice.

Answer: I need help:(

Explanation:
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