All categories

3 years ago

The chemical energy in your food is transformed into what type of energy in your moving muscles?

Physics

1 answer:

LiRa [457]3 years ago

6 0

Answer:

Mechanical energy

Explanation:

The chemical energy in the food gets changed into the mechanical energy of moving muscles.

You might be interested in

The same force is applied to two skateboards. One rolls across the room and the other moves a few feet and comes to a stop. Wher

crimeas [40]

More work was done in the skateboard that came to a stop because the one that rolled across the room moved on a surface with less friction while the second board used more work to move on a surface with much friction.

6 0

3 years ago

Read 2 more answers

The celestial sphere is

Helen [10]

Answer:

The star-sphere discovered by the Greeks and other ancient civilizations which shows the physical location in space of the nearby stars.

Explanation:

The celestial sphere is an ideal sphere, without defined radius, concentric with the terrestrial globe, in which the stars apparently move. Some ancient civilizations such as the Greeks assumed that the stars were attached to a celestial sphere, which revolves around the earth, while our planet is always immobile.

3 0

4 years ago

How does friction affect object acceleration down an incline?

Colt1911 [192]

Friction is the force that acts on the opposite side of direction of force, thus it manages to decelerate an object, so it acts upward along the plane

4 0

3 years ago

A 12,500 N alien UFO is hovering about the surface of Earth. At time , its position can be given as () = ((0.24 m/s^3)^3 + 25 m)

stepladder [879]

a) $F=(3675i-4543k)N$

b) 5843 N

Explanation:

The position of the UFO at time t is given by the vector:

$r(t)=(0.24t^3+25)i+(4.2t)j+(-0.43t^3+0.8t^2)k$

Therefore it has 3 components:

$r_x=0.24t^3+25\\r_y=4.2t\\r_z=-0.43t^3+0.8t^2$

We start by finding the velocity of the UFO, which is given by the derivative of the position:

$v_x=r'_x=\frac{d}{dt}(0.24t^3+25)=3\cdot 0.24t^2=0.72t^2\\v_y=r'_y=\frac{d}{dt}(4.2t)=4.2\\v_x=r'_z=\frac{d}{dt}(-0.43t^3+0.8t^2)=-1.29t^2+1.6t$

And then, by differentiating again, we find the acceleration:

$a_x=v'_x=\frac{d}{dt}(0.72t^2)=1.44t\\a_y=v'_y=\frac{d}{dt}(4.2)=0\\a_z=v'_z=\frac{d}{dt}(-1.29t^2+1.6t)=-2.58t+1.6$

The weight of the UFO is W = 12,500 N, so its mass is:

$m=\frac{W}{g}=\frac{12500}{9.8}=1276 kg$

Therefore, the components of the force on the UFO are given by Newton's second law:

$F=ma$

So, Substituting t = 2 s, we find:

$F_x=ma_x=(1276)(1.44t)=(1276)(1.44)(2)=3675 N\\F_y=ma_y=0\\F_z=ma_z=(1276)(-2.58t+1.6)=(1276)(-2.58(2)+1.6)=-4543 N$

So the net force on the UFO at t = 2 s is

$F=(3675i-4543k)N$

The magnitude of a 3-dimensional vector is given by

$|v|=\sqrt{v_x^2+v_y^2+v_z^2}$

where

$v_x,v_y,v_z$ are the three components of the vector

In this problem, the three components of the net force are:

$F_x=3675 N\\F_y=0\\F_z=-4543 N$

Therefore, substituting into the equation, we find the magnitude of the net force:

$|F|=\sqrt{3675^2+0^2+(-4543)^2}=5843 N$

7 0

3 years ago

What is de Broglie's hypothesis ? Make sure to be specific (qualitative and quantitative)

victus00 [196]

Answer and Explanation:

DE BROGLIE 'S HYPOTHESIS :

According to De broglie the matter have dual nature it can behave as particle as well as wave
According to this hypothesis all matter have wave like property and having wavelength.
The de broglie wavelength is given by $\lambda =\frac{h}{P}$ here h is plank's constant and P is momentum
This hypothesis determines the probability of finding the object at a give point

3 0

3 years ago