A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40° angle to the ground. The magnitude of the horizontal impulse the catapult receives from the rock is
a. 5.1 × 10^4 Ns.
b. 6.1 × 10^4 Ns.
c. 8.0 × 10^4 Ns.
d. 5.0 × 10^5 Ns.
e. 6.0 × 10^5 Ns.
B
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Two flanged shafts are connected by eight 18-mm bolts. The diam-eter of the bolt circle is 240 mm. The allowable shear stress in the bolts is 90 MPa. Ignore friction between the flange plates. The maximum value of torque T0 is approximately:
(A) 19 kN?m
(B) 22 kN?m
(C) 29 kN?m
(D) 37 kN?m
The difference between speed and velocity is that ________
A) velocity is calculated using a physics equation B) velocity is the same as acceleration but speed is different C) they are expressed in different units D) velocity also includes a direction
Doppler Effect: A police car has an 800-Hz siren. It is traveling at 35.0 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change of frequency does the observer hear?
A. 0 Hz B. 82 HZ C. 166 Hz D. 249 Hz
At position A within a tube containing fluid that is moving with steady laminar flow, the speed of the fluid is 12.0 m/s and the tube has a diameter 12.00 cm
At position B, the speed of the fluid is 18.0 m/s and the tube has a diameter 6.00 cm. What is the ratio of the density of the fluid at position A to the density of the fluid at position B? A) 3.00 B) 0.167 C) 0.375 D) 0.333 E) 0.750