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Oduvanchick [21]
2 years ago
9

A figure skater begins spinning counterclockwise at an angular speed of 3.2 π rad/s. During a 4.2 s interval, she slowly pulls h

er arms
inward and finally spins at 8.8 π rad/s.
What is her average angular acceleration
during this time interval?
Answer in units of rad/s^2
Physics
1 answer:
Paha777 [63]2 years ago
3 0

Answer:

4.2 rad/s²

Explanation:

Given:

ω₀ = 3.2π rad/s

ω = 8.8π rad/s

t = 4.2 s

Find: α

ω = αt + ω₀

8.8π rad/s = α (4.2 s) + 3.2π rad/s

α = 4.2 rad/s²

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Two point charges, with charge magnitudes q and ????, are placed a distance r apart. In this arrangement, each point charge expe
sammy [17]

Answer:

1)  Q ’= 8 Q ,  2)    q ’= 16 q ,  3)   r ’= ¾ r

Explanation:

For this exercise we will use Coulomb's law

      F = k q Q / r²

It asks us to calculate the change of any of the parameters so that the force is always F

Original values

                q, Q, r

Scenario 1

      q ’= 2q

       r ’= 4r

     F = k q ’Q’ / r’²

we substitute

     F = k 2q Q ’/ (4r)²

     F = k 2q Q '/ 16r²

we substitute the value of F

      k q Q / r² = k q Q '/ 8r²

       Q ’= 8 Q

Scenario 2

       Q ’= Q

       r ’= 4r

we substitute

      F = k q ’Q / 16r²

      k q Q / r² = k q’ Q / 16 r²

      q ’= 16 q

Scenario 3

      q ’= 3/2 q

      Q ’= ⅜ Q

we substitute

        k q Q r² = k (3/2 q) (⅜ Q) / r’²

        r’² = 9/16 r²

        r ’= ¾ r

6 0
3 years ago
VERY EASY QUESTION!!!!!! 20 POINTS!!!!!!!!
slamgirl [31]
C. at a science fair
4 0
2 years ago
Read 2 more answers
Two cars leave towns 680 kilometers apart at the same time and travel toward each other. one car's rate is 10 kilometers per hou
Evgen [1.6K]

D = distance between the cars at the start of time = 680 km

v₁ = speed of one car

v₂ = speed of other car = v₁ - 10

t = time taken to meet = 4 h

distance traveled by one car in time "t" + distance traveled by other car in time "t" = D

v₁ t + v₂ t = D

(v₁ + v₂) t = D

inserting the values

(v₁ + v₁ - 10) (4) = 680

v₁ = 90 km/h

rate of slower car is given as

v₂ = v₁ - 10

v₂ = 90 - 10 = 80 km/h

5 0
3 years ago
In February 1955, a paratrooper fell 365 m from an airplane without being able to open his chute but happened to land in snow, s
DaniilM [7]

Answer:

a. i=4760 kg*m/s

b. D_U= 1.11 m

Explanation:

a)

F= 120,000N

Kinetic energy @ impact = 120,000*depth

K_E= (1/2)*85kg*(56m/s)^2

K_E=133280 J

D_U= \frac{133280J}{120000N} = 1.11 m

b)

The momentum is equal to the impulse on him from the snow so:

p=m*v

p=85kg*56m/s

i=4760 kg*m/s

7 0
3 years ago
EXAMPLE A man is 120 cm tall and stands in front of a mirror and sees his full sized image of himself. Using a diagram, calculat
dem82 [27]

Answer: the answer is most likely that the mirror is 120 cm tall as well

Explanation:mark brainliest PLEASE.

4 0
3 years ago
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