1819

Physics Ray Optics Level: High School

The study of rainbows would fall under what subfield of physics ?

a) Mechanics

b) Thermodynamics

c) Electricity and Magnetism

d) Optics

e) Atomic Physics

Optics



1818

Physics Force & Laws Of Motion Level: High School

A 75 kg man is in an elevator that is accelerating downward at the rate of 1.5 m/s .

a) What is the true weight of the man in Newton’s ?

b) What is the net force acting on the man required to produce the acceleration ?

c) What is the apparent weight of the man in Newtons ?

d) What is the force on the man’s feet by the floor of the elevator ?




1817

Physics Force & Laws Of Motion Level: High School

A racecar rounds a curve at 80 m/s . The radius of the curve is 400 m and the mass of the car is 1500 kg .

a) What is the car’s centripetal acceleration ?

b) What is the net force on the car ?




1816

Physics Force & Laws Of Motion Level: High School

The engine of a car is part of the car and cannot push directly on the car to accelerate it . Explain what external force acting on the car is responsible for the acceleration of the car .



1815

Physics Kinematics Level: High School

A mile is 5280 feet . How many centimeters are there in a mile ?



1814

Physics Kinematics Level: High School

A boy throws a ball . It starts from rest and reaches a speed of 25 m/s in 0.25 s . What is the acceleration of the ball ?



1813

Physics Kinematics Level: High School

A car is traveling at 50 m/s and a jet is traveling at 450 m/s . How far will the

a) car travel in eight seconds ?

b) jet travel during that same time interval ?




1812

Physics Kinematics Level: High School

Relative velocity

A basketball player is running down the court at 8 m/s in a northern direction; she throws the ball to her right at a velocity of 15 m/s in the eastern direction .

a) What is the velocity (speed and direction) of the ball relative to the court ?

b) Draw a vector diagram




1811

Physics Kinematics Level: High School

Suppose a certain football player can run 100 m in 10.3 s ; what is his average speed in m/s ?



1810

Physics Gravitation Level: High School

Europa , one of Jupiter’s moons , has an average distance of 6.7 x 10^6 km from the center of the planet (circumference equals 2 pi r) . Its orbital period is 3.6 days . In metric units , what is Europa’s

a) Orbital speed

b) Acceleration




1809

Physics Kinematics Level: High School

One dimension

A suicidal maniac jumps out of a perfectly good airplane . He falls to four seconds before opening his parachute .

a) What is the downward speed jus before the chute opens (ignore the effects of air resistance) ?

b) How far below the airplane does he fall before he opens the chute ?




1808

Physics Force & Laws Of Motion Level: High School

If a curve with a radius of 80 m is perfectly banked for a car traveling 70 km/h , What must be the coefficient of static friction for a car not to skid when traveling at 90 km/h ?



1807

Physics Kinematics Level: High School

A sailboat tacking against the wind moves as follows ? 5.8 km at 45 degrees east of north . and then 4.5 km at 50 degree west of north . The entire motion takes 1h 15 Min .

What is the total displacement ?

What is the average velocity of this section of the trip ?

What is the speed , if it is assumed to be constant ?




1806

Physics Vectors Level: High School

A ship moves 10.2 km due east , and then 5.9 km due north . what are the magnitude and the direction of the resultant displacement vector ?



1805

Physics Kinematics Level: High School

The muzzle speed of a 22 caliber bullet fired from a rifle is 360 m/s . If there were no air resistance , how high would this bullet rise when fired straight up ?

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