Answer:
7800 J
Explanation:
Heat needed = mass of copper x specific heat of copper x change in temperature
Change in temperature = 30ºC - 20ºC = 10ºC
Specific heat of copper = 390 J/kgºC
Mass of copper = 2 Kg
Substituting the given values in above equation, we get –
Heat needed = 2 Kg x 390 J/kgºC x 10ºC
= 7800 J
<span>The energy released by an earthquake occurs
in the form of either volcanic eruptions or better yet, seismic waves. There is
no radiation in earthquake except if it destroys nuclear power plants.
Earthquakes are also the reason why long ago, there is a continental drift long
ago wherein <span>seismic,
volcanic, and geothermal activity are found along imagined plate boundaries, the
plates were actually rubbing against
each other as evidence is seen on the formed mountain ranges And there is paleomagnetism,
magnetic field placement in the layers of the rock are present.</span></span>
The coastline/shoreline
hope this helps
Answer:
(i) The velocity in the pipe is 0.71 m/s
(ii) A pipe diameter of 0.0029 m (0.29 cm) should be used
Explanation:
(i) Velocity (V) = Reynolds number × viscosity/density × diameter of pipe
Reynolds number = 1300
Viscosity = 0.21 Pa.s
Density = 855 kg/m^3
Diameter of pipe = 45 cm = 45/100 = 0.45 m
V = 1300×0.21/855×0.45 = 0.71m/s
(ii) Pipe diameter (D) = Reynolds number × viscosity/density×velocity
Reynolds number = 1300
Viscosity = 0.0015 Pa.s
Density = 955 kg/m^3
Velocity = 0.71 m/s
D = 1300×0.0015/955×0.71 = 0.0029 m (0.0029×100 = 0.29 cm)
Answer:
C
Explanation:
Gravity will always be attractive because it pulls things not push. For example gravity pull people to earth, that is why we don't float.
