All categories

3 years ago

What are the benefits to resistance training ?

1 answer:

8 0

Improved muscle strength and tone – to protect your joints from injury.
maintaining flexibility and balance, which can help you remain independent as you age.
weight management and increased muscle-to-fat ratio – as you gain muscle, your body burns more kilojoules when at rest.

You might be interested in

An 8 g bullet leaves the muzzle of a rifle with

Elena-2011 [213]

Answer: 1872 N

Explanation:

This problem can be solved by using one of the Kinematics equations and Newton's second law of motion:

$V^{2}=V_{o}^{2} + 2ad$ (1)

$F=ma$ (2)

Where:

$V=611.9 m/s$ is the bullet's final speed (when it leaves the muzzle)

$V_{o}=0$ is the bullet's initial speed (at rest)

$a$ is the bullet's acceleration

$d=0.8 m$ is the distance traveled by the bullet before leaving the muzzle

$F$ is the force

$m=8 g \frac{1 kg}{1000 g}=0.008 kg$ is the mass of the bullet

Knowing this, let's begin by isolating $a$ from (1):

$a=\frac{V^{2}}{2d}$ (3)

$a=\frac{(611.9 m/s)^{2}}{2(0.8 m)}$ (4)

$a=234013.5063 m/s^{2} \approx 2.34(10)^{5} m/s^{2}$ (5)

Substituting (5) in (2):

$F=(0.008 kg)(2.34(10)^{5} m/s^{2})$ (6)

Finally:

$F=1872 N$

4 0

3 years ago

A semicircular plate with radius 6 m is submerged vertically in water so that the top is 2 m above the surface. Express the hydr

dalvyx [7]

Answer: 313920

Explanation:First, we’re going to assume that the top of the circular plate surface is 2 meters under the water. Next, we will set up the axis system so that the origin of the axis system is at the center of the plate.

Finally, we will again split up the plate into n horizontal strips each of width Δy and we’ll choose a point y∗ from each strip. Attached to this is a sketch of the set up.

The water’s surface is shown at the top of the sketch. Below the water’s surface is the circular plate and a standard xy-axis system is superimposed on the circle with the center of the circle at the origin of the axis system. It is shown that the distance from the water’s surface and the top of the plate is 6 meters and the distance from the water’s surface to the x-axis (and hence the center of the plate) is 8 meters.

The depth below the water surface of each strip is,

di = 8 − yi

and that in turn gives us the pressure on the strip,

Pi =ρgdi = 9810 (8−yi)

The area of each strip is,

Ai = 2√4− (yi) 2Δy

The hydrostatic force on each strip is,

Fi = Pi Ai=9810 (8−yi) (2) √4−(yi)² Δy

The total force on the plate is found on the attached image.

5 0

3 years ago

Explain what it means when we say a substance is magnetic

galben [10]

A magnetic substance has magnetic fields. These fields start at the North Pole wrap aroundthe magnet, and terminate at the south pole of the magnet. All magnetic substances have <span>north and south poles.</span>

8 0

3 years ago

A charged particle that is moving in a static uniform magnetic field

Studentka2010 [4]

Answer:

may experience a magnetic force, but its speed will not change.

Explanation:

A charged particle moving in a static uniform magnetic field experiences a magnetic force (called Lorentz force) which is given by:

$F=qvB sin \theta$

where

q is the charge

v is the speed of the particle

B is the magnetic field intensity

$\theta$ is the angle between the direction of the motion of the charge and the direction of the magnetic field

We can notice that when $\theta=0$ (so, when the particle is moving parallel to the field), the magnetic force is zero, so the particle does not experience any force. This means that we can immediately exclude the following choice:

- will always experience a magnetic force, regardless of its direction of motion.

Moreover, the magnetic force acts perpendicular to the direction of motion of the particle. This means it will change the direction of motion of the particle, so we can also exclude the following option

- may experience a magnetic force, but its direction of motion will not change.

Finally, the fact that the magnetic force is perpendicular to the direction of motion of the particle also implies that the force does no work on the particle. According to the work-energy theorem (which states that the kinetic energy gained by the particle is equal to the work done on it), this implies that the particle gains no kinetic energy, so its speed does not change. This allows us to exclude also the following choice

- a magnetic force which will cause its speed to change.

Therefore, the correct option is the only one remained:

- may experience a magnetic force, but its speed will not change.

3 0

4 years ago

A light wave with a wavelength of 2.5*10^10 meters travels from water into diamond. What is the new wavelength of the light?

Lesechka [4]

Explanation:

please help

I need 100$ USD Dollars for buying arduino kit the proof is in the photo.

5 0

4 years ago