All categories

3 years ago

Aerobic exercise helps to

1 answer:

8 0

Build stamina. Aerobics exercises target your oxygen throughout the body, the longer the exercise, the more of the oxygen that will build up.

You might be interested in

If energy is continually added to a gas, what will it likely become?

tamaranim1 [39]

The gas will remain a gas and the energy will be transformed into heat raising the temperature
(Some very rare exceptions might occur)

5 0

3 years ago

A stuntman drives a car with a mass of 1500 kg on a drawbridge. The car accelerates with a constant force of 10,000 N. While he

Viktor [21]

Answer:

1.77 m/s^2

Explanation:

There are two forces acting on the car along the direction parallel to the incline:

- The driving force of 10,000 N, which pushes forward

- The component of the weigth of the car parallel to the incline, which pulls backward

The component of the weight of the car parallel to the incline is:

$W_p = mg sin \theta=(1500 kg)(9.8 m/s^2)( sin 30^{\circ})=7350 N$

So now we can apply Newton's second law to find the acceleration of the car:

$F-W_p = ma\\a=\frac{F-W_p}{m}=\frac{10000 N-7350 N}{1500 kg}=1.77 m/s^2$

7 0

3 years ago

A 28 g bullet pierces a sand bag 29 cm thick. If the initial bullet velocity was 55 m/s and it emerged from the sandbag with 18

Bumek [7]

The correct answer to the question is 130.4 N.

CALCULATION;

The mass of the bullet is given as m = 28 gram = 0. 028 kg.

The initial velocity of the bullet u = 55 m/s

The final velocity of the bullet v = 18 m/s.

The distance covered by the bullet through the sand bag s = 29 cm.

= 0.29 m

Let the acceleration of the bullet is a .

From equation of kinematics, we know that-

$v^2-u^2=\ 2as$

⇒ $a=\ \frac{v^2-u^2}{2s}$

$=\ \frac{(18)^2-(55)^2}{2\times 0.29}\ m/s^2$

$=\ -4656.897\ m/s^2$

The negative sign is used due to the fact that force is opposing in nature. Its velocity is decreasing with time.

From Newton's second law of motion, we know that net force on a body is equal to the product of mass with acceleration.

Mathematically F = ma.

Hence, the frictional force exerted on the bullet is calculated as -

F = m × a

= 0.028 × (-4656.897) N

= -130.4 N [ANS]

Here, N ( newton) stands for the unit of force.

8 0

3 years ago

If a biker starts at rest and accelerates to 15 m/s in 7.5 seconds, what is his<br> acceleration? *

sergeinik [125]

Answer:

2 m/s^2

Explanation:

from the question

v=15 m/s

t=7.5

a=?

from the first equation of motion

v=u+at

where,

v=final velocity

u=initial velocity

a=acceleration

t=time

from the question (u) will be zero because the body started at rest

v=u+at

15=(0)+a×7.5

15=7.5a

a=15/7.5

a=2 m/s^2

6 0

3 years ago

When riding on a plane, passengers not only move through space but they move through______as well.

Ludmilka [50]

Answer:

Explanation: the atmosphere

8 0

4 years ago

Read 2 more answers