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cold storage compartment is 4 m diameter and 4.5 m long with a thickness of 75 mm with insulating material which has a coefficient of thermal conductivity of 5.8 x10^-3 W/m-K. Calculate the quantity of heat energy leaking through the insulation per hour when the outside and inside temperature of the insulation are 15 R and -5 C.
Build the relation between relativistic momentum and energy
State Einstein's postulates of relativity
What do you mean by inertial reference frame? Explan
The AEB frame is affected by a vertical force F1=47 kN and
a horizontal force F2=28 kN, a distributed load
max q=28N/m. Pic.4
Determine the reaction of the support A and B, if the distance AC=CD=19 m, DE=38, the point K, to which the force F2 is applied, is
the middle of the segment EB, and the angle between AE and the line AB is
30. Consider the triangle AEB rectangular..
A fire fighters crew uses water cannon at 25m/s at a fixed angle of 53.0 degree above horizontal. The fire fighters want to direct the water to a blaze that is 10.0m above ground level. How far from the blaze should they position their cannon?
A firefighting crew uses a water cannon that shoots water at 25m/s at a fixed angle of 53 degrees above the horizontal. The firefighters want to direct the water at a blaze that is 10.0m above ground level. How far from the building should they position their cannon? There are two possibilities; can you get them both?
Consider a “round” rigid body with moment of inertia 𝑰 = 𝜷𝑴𝑹 𝟐 , where 𝑀 is the body’s mass, 𝑅 is the body’s radius, and 𝛽 is a constant depending on the type of the body. The center of the “round” rigid body is attached to a spring of force constant 𝑘, and then the body is made to roll without slipping on a rough horizontal surface. Due to the spring, it is expected the body will oscillate by rolling back and forth from its resting position. Determine the angular frequency and the period for small oscillations of the round rigid body. Express your answer in terms of 𝛽.
A bead slides without friction on a loop–the–loop track. If the bead is released from a height h= 30, what is its speed at point A? How large is the normal force on it if its mass is 500 gr? (R=10 cm; g=10 m/s2)
Astronomers need to identify the position of objects in the sky with very high precision. For that,
it is essential to have coordinate systems that specify the position of an object at a given time.
One of them is the equatorial coordinate system that is widely used in astronomy.
(a) Explain how the equatorial coordinate system works.
(b) What is the meaning of J2000 that o en occurs together with equatorial coordinates?
The object NGC 4440 is a galaxy located in the Virgo Cluster at the following equatorial coordi-
nates (J2000): 12h 27m 53.6s
(right ascension), 12◦
170 3600 (declination). The Calar Alto Observatory
is located in Spain at the geographical coordinates 37.23◦N and 2.55◦W.
(c) Is the NGC 4440 galaxy observable from the Calar Alto Observatory?
