Physics Kinematics Level: High School
A projectile is given an initial velocity Vo at an angle above the surface of an incline , which in turn inclined at an angle above the horizontal . Calculate the range of the projectile , measured along the surface of the incline , from the launch point. What angle gives the maximum range , measured along the incline ?
Physics Kinematics Level: High School
The velocity of the wind relative to the water is crucial to sailboats . Suppose a sailboat is in an ocean current that has a velocity of 2.20 m/s in a direction 30 degrees east of north relative to the earth . It encounters a wind that has a velocity of 4.50 m/s in a direction of 50 degrees south of west relative to earth . What is the velocity of the wind relative to the water ?
Physics Kinematics Level: High School
A jet airplane flying over Cheyenne , Wyoming , has an air speed of 260 m/s in a direction 5 degrees south of west. It is in the jet stream , which is blowing at 45.0 m/s in a direction 20 degrees south of east . What is the velocity of the airplane relative to earth ?
Physics Kinematics Level: High School
A seagull flies at a velocity of 9.00 m/s^2 straight into the wind .a) If it takes the bird 20.0 min to travel 6.00 km relative to earth , what is the velocity of the wind ?
Physics Kinematics Level: High School
a) If a runner accelerates (with constant value) from zero to 7.0 m/s in 10 minutes and then maintains that speed , how long does it take the runner to cover half of a 5 km race ?b) If the runner stops to rest , and walker walks with a constant 2.0 m/s speed , how long is the runners rest time ? Assume the runner begins his rest at the half-way point and ends his rest the instant the walker crosses the finish line .
Physics Kinematics Level: High School
A rock is catapulted at a 37 degree angle and speed of 14.3 m/s .A). If launched from a cliff that is 23.3m above the ground, how much will the range be increased by launching from the cliff compared to launching from the ground ? ignoring air resistance)
B. For both the cliff and the ground launch, what speed and direction will the rock hit the ground ?
Physics Force & Laws Of Motion Level: High School
A sled may be either pulled with a rope or pushed from behind . Assume that in either case , the propelling force acts an angle of 45 degrees above the ground .A. Draw the free body diagrams for both alternatives
B. Which would be feel the most efficient ? why ?
Physics Gravitation Level: High School
A satellite of mass 50 kg is orbiting the earth at height of 1000 km (as measure above the surface of the earth) . The mass of the earth is 5.98 x 10^24 kg and the earth’s radius is 6.38 x 10^6 m .A. Find the speed of the satellite in its orbit.
B. If this orbit were decreased, by some external mechanism, by 100km, would the speed of the satellite increase or decrease ? Why ?
Physics Force & Laws Of Motion Level: High School
An old car, with out ABS , is moving down the road at a speed , V. Ahead is an accident . The driver has two choices to stop: either locks the brakes or skid to a stop , or pumps the brakes , keep the wheels rolling until coming to a stop . Which will get the car to stop more quickly ? why ? identify any assumptions you make in answering this question .Physics Work,Power & Energy Level: High School
A ball of mass 2 kg is dropped from a height of 10m. The speed of the ball is measured as 12.5 m/s just before it hits the ground . what was the work done against air friction during this fall ?
Physics Gravitation Level: High School
The earth’s moon has a radius of 1.76 x 10^6 m and mass of 7.35 x 10^22 kg .A. Calculate the acceleration due to gravity (g) on the moon .
B. How long would it take for a mass of 1 kg to fall a distance of 2m to the surface of the moon ?G = 6.673 x 10^-11 Nm^2 / Kg^2
Physics Force & Laws Of Motion Level: High School
A block of mass m is at rest lying on the face of an incline plane . The plane makes an angle with the horizontal .A . Draw the free body diagram showing all the forces acting on the block .
B . Write the equations for the net forces acting on the block .
Physics Force & Laws Of Motion Level: High School
Block A , with a mass of 10 kg, rest on a 30 degree incline . The coefficient of kinetic friction is 0.20 . The attached string is parallel to the incline and passes over a massless , frictionless pulley at the top . Block B with a mass of 3.0 kg , is attached to the dangling end of the string . Find the acceleration of B . (magnitude and direction) :
Physics Force & Laws Of Motion Level: High School
Why do raindrops fall with constant speed during the later stages of their descent ?A. The gravitational force is the same for all drops.
B. Air resistance just balances the force of gravity.
C. The drops all fall from the same height.
D. The force of gravity is negligible for objects as small as raindrops.
E. Gravity cannot increase the speed of the falling object to more than 22 ft/s.
Physics Force & Laws Of Motion Level: High School
A 1000 kg airplane moves in straight flight at constant speed . The force of air friction is 1800 N . The net force on the plane is :A. zero
B. 11800 N
C. 1800 N
D. 9800 N
E. none of these