If an astronaut weighs 900 n on earth, what does he weigh on the planet venus?

A child is riding a merry-go-round that is turning at 7.18 rpm. If the child is standing 4.65 m from the center of the merry-go-

iVinArrow [24]

Answer:

B) 3.50 m/s

Explanation:

The linear velocity in a circular motion is defined as:

$v=\omega r(1)$

The angular frequency ( $\omega$ ) is defined as 2π times the frequency and r is the radius, that is, the distance from the center of the circular motion.

$\omega=2\pi f(2)$

Replacing (2) in (1):

$v=2\pi fr$

We have to convert the frequency to Hz:

$7.18rpm*\frac{1Hz}{60rpm}=0.12Hz$

Finally, we calculate how fast is the child moving:

$v=2\pi(0.12Hz)(4.65m)\\v=3.5\frac{m}{s}$

3 0

3 years ago

Why does a heavier object fall faster

Salsk061 [2.6K]

Explanation:

In a vacuum (no air resistance), it doesn't. All falling objects, regardless of mass, accelerate at the same rate.

However, when air resistance is taken into account, heavier objects indeed fall faster than lighter objects, provided they have the same shape and size. For example, a lead ball falls faster than a styrofoam ball.

To understand why, first look at what factors affect air resistance:

D = ½ρv²CA

where ρ is air density,

v is velocity,

C is drag coefficient,

and A is cross sectional area.

As falling objects accelerate, they eventually reach a maximum velocity where air resistance equals weight. This is called terminal velocity.

D = W

½ρv²CA = mg

v = √(2mg/(ρCA))

If we increase m while holding everything else constant, v increases. So two objects with the same size and shape but different masses will have different terminal velocities, with the heavier object falling faster.

7 0

3 years ago

Read 2 more answers

calculate your power in watts if you do 500 N*m of work picking up a dumbbell,and takes 5 s to perform that task?

Slav-nsk [51]

Answer:

100watts

Explanation:

Given parameters:

Workdone = 500Nm

Time taken = 5s

Unknown:

Power in watts = ?

Solution:

Power is the rate at which work is done;

Power = $\frac{workdone }{time}$

Input the parameters and solve;

Power = $\frac{500}{5}$ = 100watts

6 0

3 years ago

Violence and in civility between hospital employees can contribute to turnover of.........performers, hinder effective.........,

Dominik [7]

Violence and incivility between hospital employees can contribute to turnover of top performers, hinder effective teamwork, and jeopardize the quality of patient care.This is one of the most important reasons why violence and incivility in hospitals should be avoided at any cost so as to spare the employees and patients from harm and discomfort.
Read more on Brainly - brainly.com/sf/question/2641701

8 0

3 years ago

A proton is acted on by an uniform electric field of magnitude 183 N/C pointing in the positive y-direction. The particle is ini

sergey [27]

Answer:

Part a)

charge will move initially in +Y direction

Part b)

$W = 1.22 \times 10^{-18} J$