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evablogger [386]
3 years ago
15

As the temperature increases, materials with

Physics
1 answer:
Andrews [41]3 years ago
7 0

Answer:large

Explanation:

As the temperature increases, materials with large coefficients of linear expansion increases a lot in size

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A football player threw a ball upward at an angle or 24 degrees with the horizontal with A velocity of 18 m/s. What are the vert
svet-max [94.6K]

Answer:

V_y = 16.44\ m/s

V_y = 7.32\ m/s<em />

Explanation:

Given

\theta = 24

Velocity\ (V) = 18m/s

Required

Determine the vertical and horizontal components

The vertical (Vy) and horizontal (Vx) components is calculated as thus:

V_x = Vcos\theta

V_y = Vsin\theta

Calculating Vertical Components:

V_y = Vsin\theta

V_y = 18 * sin24

V_y = 18 * 0.40673664307

V_y = 7.32125957526

V_y = 7.32\ m/s<em> --- Approximated</em>

Calculating Horizontal Components:

V_x = Vcos\theta

V_x = 18 * cos24

V_x = 18 * 0.91354545764

V_x = 16.4438182375

V_x = 16.44\ m/s <em>--- Approximated</em>

4 0
3 years ago
It took Lightning McGreen 2.5 hours to travel
Law Incorporation [45]

Answer:

240km/h

Explanation:

speed=distance/time

speed=600/2.5

=240km/h

4 0
3 years ago
Read 2 more answers
I need some help w/ this:
pochemuha

Answer:

The velocity of the police car is, v = 17.798 m/s

Explanation:

Given data,

The actual frequency of the siren, f = 2010 Hz

The observed frequency of siren is, f' = 2120 Hz

The velocity of the observer, v' = 0 m/s

The velocity of the source, v = ?

The formula for Doppler effect,

                            f'=\frac{(V+v')}{(V-v)}f

Where,

                         V - velocity of sound waves in air.

                          v=V-(V+v')\frac{f}{f'}

Substituting the given values,

                         v=343-(343+0)\frac{2010}{2120}

                                 v = 17.798 m/s

Hence, the velocity of the police car is, v = 17.798 m/s

5 0
3 years ago
What are the two forces that oppose each other while a star?
Rufina [12.5K]
While self-gravity pulls the star inward and tries to make it collapse, thermal pressure (heat created by fusion) pushes outward. These two forces cancel each other out in a main sequence star, thus making it stable.
5 0
3 years ago
Describe the movement of heat energy by the process of convection
atroni [7]

Answer:

Transfer of molecules due to density-difference resulting from increased temperature of the layers of fluid bulk leads to convection.

Explanation:

When a mass of fluid is heated form the lower layers then due to the variation of the density of the fluid at different temperature we observe the movement of molecules leading to convection.

  • When the lowest level of the fluid is heated it gains temperature and the molecular bulk expands on heating and its density becomes low with respect to the bulk fluid around it and hence it flows upwards to the top most layer being lighter in weight and the lowest layer is occupied by the subsequent colder and denser layer.
  • Then again the lowest layer is heated and the process continues forming a cycle heating through the bulk transfer of fluid layers called convention.

6 0
4 years ago
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