A woman looking in a makeup mirror sees her face at twice its actual size and right-side up. If she is 21.0 cm from the mirror, what is its focal length?
a. 14.0 cm
b. 42.0 cm
c. 10.5 cm
d. 42.0 cm
e. 21.0 cm
d
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A 5.00-m-long ladder, weighing 200 N, rests against a smooth vertical wall with its base on a horizontal rough floor, a distance of 1.20 m away from the wall
The center of mass of the ladder is 2.50 m from its base, and the coefficient of static friction between the ladder and the floor is 0.200. How far up the ladder, measured along the ladder, can a 600-N person climb before the ladder begins to slip? A) 1.50 m B) 1.26 m C) 1.05 m D) 3.95 m E) 4.56 m
A 50.0-kg person stands on a 200-kg raft, which is at rest. She starts to walk on the raft with a speed of 3.00 m/s with respect to the raft. What is the speed of the person relative to the water?
A) 2.40 m/s B) 0.225 m/s C) 0.500 m/s D) 0.750 m/s E) 1.20 m/s
A car with a radio antenna 1.0 m long travels at 80 km/h in a locality where the Earth's magnetic field is 5.0 × 10^-5 T. What is the maximum possible emf induced in the antenna as a result of moving through the Earth's magnetic field?
Most neutron stars are the remnants of _____ explosions
a. type II supernovae b. type Ib supernovae c. type Ia supernovae d. novae e. planetary nebulae