Physics Force & Laws Of Motion Level: High School
A box is sliding down a plane inclined at an angle of 20 degree from the horizontal . Find the acceleration of the box , neglecting friction and air resistance .
Physics Dimensions Level: High School
Plank’s constant ,denoted by h (used in the quantum theory of radiation) is measured in joule-seconds in the mks system . From this we can determine that plank’s constant is dimensionally equal to :a) [ML2 T-3]
b) [L2T – 2]
c) [MLT – 1]
d) [ML2T – 1]
Physics Vectors Level: High School
If the magnitude of the product A x B is equal to the AB , thena) Vector A and B cannot be in the same plane .
b) Vector A and B must be parallel and point in the same direction .
c) Vector A and B must be parallel but point in opposite directions .
d) vector A and B must be at right angles .
Physics Kinematics Level: High School
In Bosnia ,the ultimate test of a young man’s courage once was to jump off a 400 year old bridge (now destroyed) into the River Neretva, 21 meters below the bridge . The free fall acceleration is 9.80 m/s^2 .a) How long did the jump last ?
b) How fast was the diver traveling upon impact with the river ?
c) If the speed of sound in air is 339 m/s , how long after the diver took off did a spectator on the bridge hear the splash ?
Physics Kinematics Level: High School
Another scheme to catch the roadrunner has failed .Now a safe falls from rest from the top of a 20.5 meter high cliff toward Wile E . Coyote , who is standing at the base . Wile fist notices the safe after it has fallen 16.0 meters . How long does he have to get out of the way ? The free fall acceleration is 9.80 m/s^2 .
Physics Kinematics Level: High School
The driver of a truck slams on the brakes when he sees a tree blocking the road . The truck slows down uniformly with an acceleration of -4.90 m/s^2 for 3.80 s , making skid marks 54.1 m long that end at the tree . With what speed does the truck then hit the tree ?
Physics Kinematics Level: High School
Projectile motion
A projectile is launched with an initial speed of 60.0 m/s at an angle of 30.0 degrees above the horizontal . The projectile lands on a hillside 4.00 s later . Neglect air friction.
a) What is the projectile velocity at the highest point of its trajectory ?
b) What is the straight line distance from where the projectile was launched to where it hits its target ?
Physics Kinematics Level: High School
Projectile motion
A brick is thrown upward from the top of a building at an angle of 25 degrees to the horizontal and with an initial speed of 15 m/s . If the brick is in flight for 3.0 s , how tall is the building ?
Physics Kinematics Level: High School
Projectile motion
Tom the cat is chasing Jerry the mouse across the surface of a table 1.5 m above the floor . Jerry steps out of the way at the last second and Tom slides off the edge of the table at a speed of 5.0 m/s .Where will Tom strike the floor and what velocity components will he have just before he hits ?
Physics Kinematics Level: High School
Projectile motion
One of the fastest recorded pitches in major league baseball was clocked at 101.0 mi/h . If a pitch were thrown horizontally with this velocity , how far would the ball fall vertically by the time it reached home plate 60.5 ft away ?
Physics Vectors Level: High School
A vector has an x-component of -25.0 units and a y-component of 40.0 units . Find the magnitude and direction of the vector .
Physics Vectors Level: High School
A person walks 25.0 degrees north of east for 3.10 km . How far would the person walk due north and due east to arrive at the same location ?
Physics Vectors Level: High School
An airplane flies 200 km due west from city A to city B and then B then 300 km in the direction of 30.0 degrees north of west from city B to city C .a) In straight-line distance ,how far is city C from city A ?
b) Relative to city A , what direction is city C ?
Physics Ray Optics Level: High School
Suppose that Young’s experiment is performed with light of wavelength 548 nm . The slits are 1.16 mm apart , and the viewing screen is 4.12 m from the slits . How far apart are the bright fringes in meters ?
Physics Ray Optics Level: High School
Monochromatic light of wavelength 469 nm illuminates two parallel narrow slits 6.63 micro m apart . Calculate the angular deviation of the third-order (for m = 3) bright fringe