PHYSICS HIGH SCHOOL

A shot-putter throws an 8.00 kg shot at a speed of 10.0 m/s. What is the kinetic energy of the shot?

Answers

Answer 1

Answer:

Answer:

Kinetic energy of the shot is 400 Joules

Explanation:

It is given that,

Mass of the shot, m = 8 kg

Speed of thrown, v = 10 m/s

We have to find the kinetic energy of the shot. It is given by the product of mass of an object and the square of velocity divided by 2 i.e.

$KE=(1)/(2)mv^2$

$KE=(1)/(2)* 8\ kg* (10\ m/s)^2$

KE = 400 Joules

Hence, the kinetic energy of the shot is 400 joules.

Answer 2

Answer: Ekin=1/2*m*v^2 so 1/2*8*(10m/s)^2 = 400Nm Or J

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Earth's gravity acts upon objects with a steady force of __________.a. 8.9 meters per second
b. 9.8 meters per minute
c. 8.9 meters per minute squared
d. 9.8 meters per second squared

Answers

None of the choices is a force. 'a' and 'b' are speeds. 'C' and 'd' are accelerations. ... The steady force of gravity is 9.8 newtons PER KILOGRAM of mass. ... The question is written by someonewho very much wants to discourage anyone interested in Physics.

Answer:

9.8 meters per second squared

Explanation:

Starvation is the result of a mal-distribution of food, which is primarily due to drought and a lack of resources.
exportation.
civil war.
dictatorships.

Answers

Starvation is the result of amal-distribution of food, which is primarily due to drought and of course, alack of resources. From the choices above, of course dictatorships, which isexploiting the citizens’ natural resources for one’s own tyrannical benefit maylead to lack of resources. Civil war, will not only cause casualties but lackof resources as well. As well as too much exportation of resources leavingnothing for the country. The point is, everything will cause lack of resourcesbut lack of resources is the root cause of starvation where the demands of thepeople are greater than the supply.

Consider a portion of a cell membrane that has a thickness of 7.50 nm and 1.4 µm ✕ 1.4 µm in area. A measurement of the potential difference across the inner and outer surfaces of the membrane gives a reading of 86.0 mV.a) Determine the amount of current that flows through this portion of the membrane
b) By what factor does the current change if the side dimensions of the membrane portion is halved? The other values do no change
increase by factor of 2
decrease by factor of 8
decrease by factor of 2
decrease by a factor of 4
increase by factor of 4

Answers

Answer:

Part a: The current is 1.49x10⁻¹² A

Part b: The current is decreased by a factor of 4.

Explanation:

Part a

The area is given as

A =(1.4*10⁻⁶)² =1.96*10⁻¹² m²

The resistance is given as where resistivity of the membrane material is 1.30 x 10⁷ ohms*m

R=pL/A =(1.3*10⁷)(7.5*10⁻⁹)/(1.96*10⁻¹²)

R=4.97x10¹⁰ ohms

So the resistance is 4.97x10¹⁰ ohms.

I=V/R =86.0x10⁻³/5.77x10¹⁰

I=1.49x10^⁻¹² A

So the current is 1.49x10⁻¹² A

S=So/2=1.4/2 =0.7μm

A=(0.7*10^-6)^2=4.9*10⁻¹³ m²

R=pL/A =(1.3*10⁷)(7.5*10⁻⁹)/(4.9*10⁻¹³)

R=1.98x10¹¹ ohms

So the resistance is 1.98x10¹¹ ohms.

I=V/R =86.0x10⁻³/1.98x10¹¹

I2=4.52x10^⁻¹³ A

So the ratio of the new current vs the old current is as

I2/I=4.52x10^⁻¹³/1.49x10⁻¹²=0.25

So the current is decreased by a factor of 4.

The light you see around you from the Sun is called UVvisibleX-infrared rays.

Answers

The correct answer for the question that is being presented above is this one: "Ultraviolet rays." The light you see around you from the Sun is called ultraviolet rays. Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light.

A sport car moving at constant speed travels 110m in 5.0 s. if it then brakes and comes to a stop in 4.0 s, what is the magnitude of its acceleration in m/s2, and in g’s (g=9.80 m/s2)? 2

Answers

d = 110 m, t = 5 s
v o = 110 cs : 5 m = 22 m/s
-------------------------------------
v = v o - a t
v = 0 m/s, v o = 22 m/s, t = 4 s
0 = 22 - 4 a
4 a = 22
a = 22 : 4
a = 5.5 m/s²
g = 9.80 m/s²
9.80 : 5.5 = 0.56
Answer:
The magnitude of its acceleration is 5.5 m/s or 0.56 g.

Which characteristics do all terrestrial planets have? Select all that apply.A. Water
B. Iron core
C. Rocky crust
D. Thin atmosphere
E. Dense atmosphere
F. Relatively high density

Answers

"Terrestrial" means 'on Earth' or 'like Earth'.

The so-called 'terrestrial planets' are Mercury, Venus, Earth, and Mars.
The asteroid belt separates them from the 4 gas-giant planets, in a wide
gap where there should be another planet but there isn't.

Among the terrestrial planets as a group:

A). Water
   No. Only earth has water (now).

B). Iron core
   Yes. Most probably all.

C). Rocky crust
   Yes. All.

D). Thin atmosphere.
E). Dense Atmosphere.
   No.
   Only Venus has a dense one.
   Mercury probably has none.
   Earth has the Goldilocks atmosphere.

F). Relatively high density.
   Yes.
   True of all the terrestrial planets.
   Earth is the most dense of all the planets.

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