A golf club exerts an average force of 1000 N on a 0.045-kg golf ball which is initially at rest. The club is in contact with the ball for 1.8 ms. What is the speed of the golf ball as it leaves the tee?
A) 30 m/s
B) 35 m/s
C) 40 m/s
D) 45 m/s
E) 50 m/s
C
You might also like to view...
Weight and g: If you stood on a planet having a mass four times that of Earth's mass, and a radius two times that of Earth's radius, you would weigh
A. the same as you do on Earth. B. two times more than you do on Earth. C. two times less than you do on Earth. D. four times more than you do on Earth.
Atmospheric air at 10°C enters a 2 m long smooth rectangular duct with a 7.5 cm x 15 cm cross-section. The mass flow rate of the air is 0.1 kg/s. If the sides are at 150°C, estimate (a) the heat transfer coefficient, (b) the air outlet temperature, (c) the rate of heat transfer, and (d) the pressure drop.
GIVEN
Atmospheric air flow through a rectangular duct
Inlet bulk temperature (Tb,in) = 10°C
Duct length (L) = 2 m
Cross-section = 7.5 cm x 15 cm = 0.075 m ? 0.15 m
Mass flow rate (m) = 0.1 kg/s
Duct surface temperature (Ts) = 150°C
FIND
(a) The heat transfer coefficient ch
(b) The air outlet temperature (Tb,out)
(c) The rate of heat transfer (q)
(d) The pressure drop (?p)
ASSUMPTIONS
Steady state
The duct is smooth
SKETCH
for dry air at the inlet bulk temperature of 20°C
Thermal conductivity (k) = 0.0251 W/(m K)
Absolute viscosity (?) = 18,240 × 10–6 (Ns)/m2
Prandtl number (Pr) = 0.71
Specific heat (c) = 1012 J/(kg K)
Which of the following places the structures in our own part of the universe in order of increasing (smallest to largest) scale?
A) Solar System, Local Group, Milky Way Galaxy, Local Supercluster B) Local Supercluster, Local Group, Milky Way Galaxy, Solar System C) Solar System, Milky Way Galaxy, Local Supercluster, Local Group D) Solar System, Milky Way Galaxy, Local Group, Local Supercluster
What are the two geological features that appear to set Earth apart from all the other terrestrial worlds?
A) a dense core and plate tectonics B) mantle convection and a thick atmosphere C) significant volcanism and tectonics D) plate tectonics and widespread erosion