What is the kinetic energy of a 0.160-kg ball thrown at 40.0 m\/s (90.0 mph)?


Answer: Given that -

m = 0.160 kg

v = 40.0 m/s

Kinetic energy, KE = (1/2)*m*v^2

put the values -

KE = 0.5*0.160*40^2 = 128 Joule.

Physics & Space Science

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In a heat exchanger, as shown in accompanying figure, air flows over brass tubes of 1.8- cm-ID and 2.1-cm-OD that contain steam. The convection heat-transfer coefficients on the air and steam sides of the tubes are 70 W/(m2 K) and 210 W/(m2 K), respectively. Calculate the overall heat transfer coefficient for the heat exchanger (a) based on the inner tube area, (b) based on the outer tube area.

GIVEN
• Air flow over brass tubes containing steam
• Tube diameters
? Inside (Di) = 1.8 cm = 0.018 m
? Outside (Do) = 2.1 cm = 0.021 m
• Convective heat transfer coefficients
? Air side h c= 70 W/(m2 K)
? Steam side h i= 210 W/(m2 K)
FIND
• The overall heat transfer coefficient for the heat exchanger based on
(a) the inner tube area (Ui) and
(b) the outer tube area (Uo)
ASSUMPTIONS
• The heat transfer coefficients are uniform over the transfer surfaces
SKETCH

PROPERTIES AND CONSTANTS
the thermal conductivity of brass at 20°C (kb) = 111 W/(m K)

Physics & Space Science

An 8000 kg satellite is launched from the surface of the earth, and injected into a circular orbit at an altitude of 100 km above the surface of the earth. The kinetic energy of the satellite in the circular orbit is

A.
B.
C.
D.
E.

Physics & Space Science

A 2000-kg sailboat experiences an eastward force of 3000 N by the ocean tide and a wind force against its sails of magnitude 6000 N directed toward the northwest (45° N of W). What is the magnitude and direction of the resultant acceleration?

What will be an ideal response?

Physics & Space Science

A very dense 1500-kg point mass (A) and a dense 1200-kg point mass (B) are held in place 1.00 m apart on a frictionless table

A third point mass is placed between the other two at a point that is 20.0 cm from B along the line connecting A and B. When the third mass is suddenly released, find the magnitude and direction (toward A or toward B) of its initial acceleration. (G = 6.67 × 10-11 N ? m2/kg2)

Physics & Space Science