A motorcycle daredevil wants to ride up a 50.0 m ramp set at a 30.0° incline to the ground. It will launch him in the air and he wants to come down so he just misses the last of a number of 1.00 m diameter barrels. If the speed at the instant when he leaves the ramp is 60.0 m/s, how many barrels can be used?
a. 79
b. 318
c. 332
d. 355
e. 402
d
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A coaxial cable consists of an inner cylindrical conductor of radius R1 = 0.040 m on the axis of an outer hollow cylindrical conductor of inner radius R2 = 0.080 m and outer radius R3 = 0.090 m
The inner conductor carries current I1 = 4.40 A in one direction, and the outer conductor carries current I2 = 7.70 A in the opposite direction. What is the magnitude of the magnetic field at the following distances from the central axis of the cable? (?0 = 4? × 10-7 T ? m/A) (a) At r = 0.060 m (in the gap midway between the two conductors) (b) At r = 0.150 m (outside the cable)
The helium atom has one more electron than hydrogen. The chemical properties differ because helium
A. and hydrogen are equally reactive since chemical bonding has nothing to do with the number of electrons. B. has neutrons in the nucleus. C. is much less reactive, since its two electrons form a stable closed shell. D. is more reactive, since it has two electrons that can form chemical bonds.
The units gal/h can be converted to which of the following units?
(i) m/s (ii) cm/s2 (iii) mm3/y (iv) liters/acre
1.only (iii) 2.(i) and (iv) 3.(iii) and (iv) 4.(ii) and (iv)Radioactive Decay: A thallium source with a half-life of 3.7 years was certified at 10 kBq ten years ago. What is its activity now?
A. 4.7 kBq B. 3.3 kBq C. 1.5 kBq D. 1.0 kBq