1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Leno4ka [110]
3 years ago
10

A centrifuge used in DNA extraction spins at a maximum rate of 7000rpm producing a "g-force" on the sample that is 6000 times th

e force of gravity. If the centrifuge takes 10 seconds to come to rest from the maximum spin rate: a) What is the angular acceleration of the centrifuge? b)what is the angular displacement of the centrifuge during this time
Physics
1 answer:
defon3 years ago
8 0

Answer:

A) a = 73.304 rad/s²

B) Δθ = 3665.2 rad

Explanation:

A) From Newton's first equation of motion, we can say that;

a = (ω - ω_o)/t. We are given that the centrifuge spins at a maximum rate of 7000rpm.

Let's convert to rad/s = 7000 × 2π/60 = 733.04 rad/s

Thus change in angular velocity = (ω - ω_o) = 733.04 - 0 = 733.04 rad/s

We are given; t = 10 s

Thus;

a = 733.04/10

a = 73.304 rad/s²

B) From Newton's third equation of motion, we can say that;

ω² = ω_o² + 2aΔθ

Where Δθ is angular displacement

Making Δθ the subject;

Δθ = (ω² - ω_o²)/2a

At this point, ω = 0 rad/s while ω_o = 733.04 rad/s

Thus;

Δθ = (0² - 733.04²)/(2 × 73.304)

Δθ = -537347.6416/146.608

Δθ = - 3665.2 rad

We will take the absolute value.

Thus, Δθ = 3665.2 rad

You might be interested in
Which will increase the energy of motion of water molecules?
Allisa [31]
A) add heat will be the answer
4 0
3 years ago
Es el cambio de estado en el que un sólido pasa a gaseoso sin pasar por el estado líquido o viceversa
Yakvenalex [24]

Answer:

what

Explanation:

8 0
3 years ago
A 3.50 kg block is pushed along a horizontal floor by a force of magnitude 15.0 N at an angle θ = 30.0° with the horizontal. The
Crank

Answer :

The frictional force on the block from the floor and the  block's acceleration are 10.45 N and 0.73 m/s².

Explanation :

Given that,

Mass of block = 3.50

Angle = 30°

Force = 15.0 N

Coefficient of kinetic friction = 0.250

We need to calculate the frictional force

Using formula of frictional force

F_{k}=\mu N

F_{k}=\mu (F\sin\theta+mg)

F_{k}=0.250\times(15\times\sin30^{\circ}+3.50\times9.8)

F_{k}=0.250\times41.8

F_{k}=10.45\ N

(II). We need to calculate the block's acceleration

Using newton's second law of motion

F=ma

a=\dfrac{F}{m}

a=\dfrac{F\cos\theta-F_{k}}{m}

a=\dfrac{15.0\cos30^{\circ}-10.45}{3.50}

a=0.73\ m/s^2

Hence, The frictional force on the block from the floor and the  block's acceleration are 10.45 N and 0.73 m/s².

8 0
3 years ago
A cyclist must travel 800 kilometers. How many days will the trip take if the cyclist travels at an average speed of 16 km/h
Sloan [31]

Answer:

2 days 2 hours or 50 hours

Explanation:

800/16=50

8 0
3 years ago
What happens when a ray of light is directed at a mirror, a glass block and a prism?
zimovet [89]
When it is directed at a mirror it is reflected
When it is directed at a glass block it refracts
When it is directed through a prism the light splits to form a spectrum ( red orange yellow green blue indigo and violet )

Hope this is ok
5 0
3 years ago
Other questions:
  • If a rock is thrown upward on the planet mars with a velocity of 17 m/s, its height (in meters) after t seconds is given by h =
    6·1 answer
  • Who is Rachel Carson and why is she important to environmentalism
    9·1 answer
  • An iron wire and a copper wire of the same length have the same potential difference applied to them. What must be the ratio of
    10·1 answer
  • A 0.108-kg block is suspended from a spring. When a small pebble of mass 31 g is placed on the block, the spring stretches an ad
    13·1 answer
  • A point charge is placed at the center of a spherical Gaussian surface. The electricflux ΦEischangedif(a) a second point charge
    5·1 answer
  • The coefficient of static friction between waxed skis and now snow is 0.14. What force will be needed to get a 700 N skier at re
    12·2 answers
  • What is the definition of recoil velocity?
    8·2 answers
  • 1.) How much potential energy does an object with a mass of 3 kg have on top of a stand 12 meters
    13·1 answer
  • Changing the ____ of the flow of electric current in a wire coil
    13·1 answer
  • What do atoms of elements in a group have that makes their properties similar? A. the same atomic mass
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!