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
Leviafan [203]
3 years ago
15

Two basketball players are essentially equal in all respects. (They are the same height, they jump with the same initial velocit

y, etc.) In particular, by jumping they can raise their centers of mass the same vertical distance, (called H their "vertical leap"). The first player, Arabella, wishes to shoot over the second player, Boris, and for this she needs to be as high above Boris as possible. Arabella jumps at time , and Boris jumps later, at time (his reaction time). Assume that Arabella has not yet reached her maximum height when Boris jumps.
1)Find the vertical displacement , D(t) = H(a)(t) - H(b)(t) as a function of time for the interval 0 < t < t(r) , where H(a)(t) is the height of the raised hands of Arabella, while H(b)(t) is the height of the raised hands of Boris.

Express the vertical displacement in terms of H, g , and t.
Physics
1 answer:
ser-zykov [4K]3 years ago
7 0
The reaction time of Boris is t(r), so before that, Boris will not have jumped. Thus, H(b)(t) = 0
The vertical displacement will simply be
D(t) = H(a)(t)
You might be interested in
Two different sub-atomic particles are described below: Particle Y: Carries a positive charge Particle Z: Orbits the nucleus Whi
torisob [31]
Y is a proton and z is an electron. Protons and neutrons are in the nucleus.
7 0
3 years ago
Read 2 more answers
If one's hands are being warmed by holding them to one side of a flame, the predominant form of heat transfer is what process?
avanturin [10]

Answer:

b. radiation

Explanation:

The correct choice is

b. radiation

Radiation is the process of heat transfer where no medium is required. Air is present between hands and flame and thermal conductivity of air is very low.

The hands are not in direct contact with the flame, hence conduction process of heat transfer is not possible.

In convection process of heat transfer, we have the warmer part of the medium moving towards the colder part. hence the convection is also not responsible for transfer of heat in this scenario

4 0
3 years ago
A wave takes 2 seconds to reach the end. what is the frequency of the wave?
zaharov [31]

Frequency=0.5

Explanation:

frequency =1/Time

F=1/2=0.5

6 0
3 years ago
Solve problem which attached
timofeeve [1]
The file is blank!

*Explanation:* maybe add another?
7 0
3 years ago
A machinist turns on the power on to a grinding wheel at time t= 0 s. The wheel accelerates uniformly from rest for 10 s and rea
Ugo [173]

Answer:

θt = 514.3 revolutions

Explanation:

(1)The wheel accelerates uniformly from rest for 10 s and reaches the operating angular speed of 58rad/s.

The uniformly accelerated circular movement  a circular path movement in which the angular acceleration is constant.

We apply the equations of circular motion uniformly accelerated

ωf = ω₀ + α*t  Formula (1)

θ = ω₀*t + (1/2)*α*t² Formula (2)

ωf² = ω₀² +2*α*θ Formula (3)

Where:

θ : angle that the body has rotated in a given time interval (rad)

α : angular acceleration (rad/s²)

t : time interval (s)

ω₀ : initial angular speed ( rad/s)

ωf : final angular speed ( rad/s)

Number of revolutions made by the wheel from t = 0 to t = 10 s

Data

ω₀ = 0

t = 10 s

ωf = 58 rad/s

We replace data in the formula (1) to calculate α

ωf = ω₀ + α*t

58 = 0 + α*(10)

α = 58 /10

α = 5.8 rad/s²

We replace data in the formula (2) to calculate θ

θ = ω₀*t + (1/2)*α*t²

θ = 0 + (1/2)*( 5.8)*(10)²

θ₁ = 290 rad

(2)The wheel is run at that angular velocity for 30 s, and then power is shut off.

The movement of the wheel is circular with constant angular speed and the formula to calculate θ is:

θ = ω*t

ω = 58 rad/s  , t= 30s

θ = (58 rad/s)*(30)

θ = (58 rad/s)*(30)

θ ₂= 1740 rad

(3)The wheel slows down uniformly at 1.4 rad/s² until the wheel stops.

ω₀ = 58 rad/s

α = -1.4 rad/s²

ωf = 0

We replace data in the formula (3) to calculate θ

(ωf)² = (ω₀)² + (2)*(α )*θ

0 = (58)² + (2)*(-1.4)*θ

(2)*(1.4)*θ = (58)²

θ = (58)² / (2.8)

θ = (58)² / (2.8)

θ₃ = 1201.42 rad

Total number of revolutions made by the wheel (θt)

θt =θ₁+θ₂+θ₃

θt  = 290 rad+ 1740 rad + 1201.42 rad

θt  = 3231.42 rad

1 revolution = 2π rad

θt = 3231.42 rad* ( 1revolution/2π rad)

θt = 514.3 revolutions

7 0
3 years ago
Other questions:
  • 2. Două surse coerente oscileaza cu frecventa de 1 Hz, iar undele generate de elel se propaga pe suprafața apei cu viteza de 1,
    7·1 answer
  • The carpal bones in the hands are an example of __________.
    9·2 answers
  • A proton is traveling horizontally to the right at 4.60×106 m/s . Part A Find (a)the magnitude and (b) direction of the weakest
    7·1 answer
  • Based on Planet Z's size, orbital distance, and rotation rate, which of the following properties is it likely to have?
    7·1 answer
  • Refer to Figure 13-2 and determine how much parent material will be left after five half-lives
    14·2 answers
  • Find the kinetic energy of a ball with a mass of 0.06 kg moving at 50 m/s
    13·1 answer
  • Hurricanes are formed due to
    14·2 answers
  • A skier weighing 86.2 kg starts from rest and slides down a 32.0-m frictionless slope that is inclined at an angle of 15.0° with
    14·1 answer
  • How are the interference patterns for light through a double slit and light through a single slit similar yet different
    5·1 answer
  • Why do ice cubes float to the top of a glass of water?
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!