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
Bess [88]
3 years ago
7

Quiz Active 1 2 3 4 5 6 7 8 10 TIME REMAINING 52:33 Which conclusion is best supported by the information? Rhea kicks a soccer b

all at 13 km/h to Sean. After kicking the ball, the speed of the soccer ball from Rhea's reference trame is 13 km/h. The speed of the soccer ball from Sean's reference frame is 22 km/h. Sean is standing still, and Rhea is running toward Sean while kicking the ball. O Rhea is standing still after kicking the ball, and Sean is running away from Rhea. Both soccer players are standing still after the ball is kicked Both soccer players are running while the ball is in moton.​
Physics
1 answer:
omeli [17]3 years ago
4 0

Answer:

Sean is standing still, and Rhea is running toward Sean while kicking the ball.

Explanation:

The conclusion that is best supported by the information is the fact that Sean is standing still, and Rhea is running toward Sean while kicking the ball. This answer is chosen because from the question it is stated that Rhea kicks the ball to Sean and the velocity of the ball is faster from Sean's point of reference. This is only possible if Rhea was already in motion, as his own speed would have been countered by the speed of the ball in itself. Thereby making the speed of the ball slower from his point of his reference

You might be interested in
A simple pendulum is made from a 0.54-m-long string and a small ball attached to its free end. The ball is pulled to one side th
Serga [27]

Answer:

0.37sec

Explanation:

Period of oscillation of a simple pendulum of length L is:

T = 2 π × √ (L /g)

L=length of string 0.54m

g=acceleration due to gravity

T-period

T = 2 x 3.14 x √[0.54/9.8]

T = 1.47sec

An oscillating pendulum, or anything else in nature that involves "simple harmonic" (sinusoidal) motion, spends 1/4 of its period going from zero speed to maximum speed, and another 1/4 going from maximum speed to zero speed again, etc. After four quarter-periods it is back where it started.

The ball will first have V(max) at T/4,

=>V(max) = 1.47/4 = 0.37 sec

3 0
3 years ago
A toaster using a Nichrome heating element operates on 120 V. When it is switched on at 28 ∘С, the heating element carries an in
sukhopar [10]

Answer:

The final temperature of the element = 262.67°C

The power dissipated in the heating element initially = 163.21 W

The power dissipated in the heating element when the current reaches 1.23 A = 147.60 W

Explanation:

Our given parameters include;

A Nichrome heating element operates on 120 V.

Voltage (V) = 120V

Initial Current (I₁) = 1.36 A

Initial Temperature (T₁) = 28°C

Final Current (I₂) = 1.23 A

Final Temperature (T₂) = unknown ????

Temperature dependencies of resistance is given by:

R_{T(2)}=R_1[1+\alpha (T_2-T_1)]            ----------------------    (1)

in which R₁ is the resistance at temperature T₁

R_{T(2) is the resistance at temperature T₂

Given that V= IR

R = \frac{V}{I}

Therefore, the resistance at temperature 28°C is;

R_{28}= \frac{120V}{1.36A}

= 88.24Ω

R_{T(2) = \frac{120V}{1.23A}

= 97.56Ω

From (1) above;

R_{T(2)}=R_1[1+\alpha (T_2-T_1)]      

97.56 = 88.24 [ 1 + 4.5×10⁻⁴(°C)⁻¹(T₂-28°C)]

\frac{97.56}{88.24}= 1+(4.5*10^{-4})(T-28^0C)

1.1056 - 1 = 4.5×10⁻⁴(°C)⁻¹(T₂-28°C)

0.1056 = 4.5×10⁻⁴(T₂-28°C)

\frac{0.1056}{4.5*10^{-4}}= T-28^0C

T - 28° C = 234.67

T = 234.67 + 28° C

T = 262.67 ° C

(b)

What is the power dissipated in the heating element initially and when the current reaches 1.23 A

The power dissipated in the heating element initially can be calculated as:

P = I²₁R₂₈

P = (1.36A)²(88.24Ω)

P = 163.209 W

P ≅ 163.21 W

The power dissipated in the heating element when the current reaches 1.23 A can be calculated as:

P= I^2_2R_{T^0C

P = (1.23)²(97.56Ω)

P = 147.598524

P ≅ 147.60 W

6 0
3 years ago
A plane wave with a wavelength of 500 nm is incident normally ona single slit with a width of 5.0 × 10–6 m.Consider waves that r
kaheart [24]

To solve this exercise it is necessary to use the concepts related to Difference in Phase.

The Difference in phase is given by

\Phi = \frac{2\pi \delta}{\lambda}

Where

\delta = Horizontal distance between two points

\lambda = Wavelength

From our values we have,

\lambda = 500nm = 5*10^{-6}m

\theta = 1\°

The horizontal distance between this two points would be given for

\delta = dsin\theta

Therefore using the equation we have

\Phi = \frac{2\pi \delta}{\lambda}

\Phi = \frac{2\pi(dsin\theta)}{\lambda}

\Phi = \frac{2\pi(5*!0^{-6}sin(1))}{500*10^{-9}}

\Phi= 1.096 rad \approx = 1.1 rad

Therefore the correct answer is C.

6 0
3 years ago
What is the speed of a wave with 3Hz frequency and a wavelength of 9 m
SIZIF [17.4K]

Answer:

Given

Frequency (f) = 3Hz

Wavelength = 9 m

Speed = ?

Explanation:

we know

Speed = wavelength * frequency

= 9*3

= 27 m/ s

7 0
3 years ago
Which type of lens will produce a virtual image
Naily [24]

When a object is close to the converging lens it behaves like a magnifying glass. Therefore convex mirror produces a virtual image. A real image occurs when a ray converges, whereas virtual image occurs when rays only Appear to converge.

7 0
3 years ago
Other questions:
  • In a(n) BLANK , the matter’s identity stays the same.
    13·1 answer
  • You are an industrial engineer with a shipping company. As part of the package- handling system, a small box with mass 1.60 kg i
    15·1 answer
  • A tiger leaps horizotally from a 15.5 m high rock with a speed of 7.5 m/s. How
    5·1 answer
  • A 10 kg body is suspended by a rope is pulled
    14·1 answer
  • Juan lives 100m away from bill whats juan`s average speed if he reaches bill home in 50 s
    10·1 answer
  • What is the control group used for
    6·1 answer
  • In the following reaction, identify the missing particle:
    15·1 answer
  • Will mark brainliest if correct!!!!!!!!!!!!!!!!!!!!!!!!!!!
    5·1 answer
  • 13. Under what condition (if any) does a moving body experience no energy even though there
    9·1 answer
  • If an object is not accelerating, then one knows for sure that it is_____.​
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!