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Q. A hiker begins a trip by first walking 24.1 km southeast from her base camp. On the second day, she walks 46.8 km in a direction 65.9 degrees north of east, at which point she discovers a forest ranger's tower. Determine the y component of the total displacement and magnitude of the resultant displacement.
Q. A 7-kg projectile is fired with an initial speed of 137 m/s at an angle of 34° with the horizontal. At the top of its trajectory, the projectile explodes into two fragments of masses 2.6 kg and 4.4 kg. At 4.1 s after the explosion, the 4.4-kg fragment lands on the ground directly below the point of explosion.
(a) Determine the magnitude of the velocity of the 2.6-kg fragment immediately after the explosion.
(b) Find the distance between the point of firing and the point at which the 2.6-kg fragment strikes the ground.
What is the magnitude of the vertical component of its velocity as it strikes the ground.
Much of the material making up Saturn's rings is in the form of tiny dust grains having radii on the order of 10-6 m. These grains are located in a region containing a dilute ionized gas, and they pick up excess electrons. As an approximation, sup..
Determine the force of gravity between earth (mass =6.0x10^24kg) and the moon (mass= 7.4x10^22kg). The average earth-moon distance is 3.8x10^8m.
A submarine dives 90.0 m at an angle of 8.0° below the horizontal. What are the horizontal and vertical components of submarine's displacement? (Imagine that upward and the direction of the submarine's horizontal motion is positive.)
A hot air balloon is rising straight up with a speed of 6.0 m/s. A ballast bag is released from rest relative to the balloon when it is 9.54 m above the ground. How much time elapses before the ballast bag hits ground.
An airplane with a mass of 2.6*10^6 kg. has the air flow past the lower surface of the wings at 100 m/s. If the wings have a surface area of 1200 m2, how fast should the air flow over the upper surface of the wing if the plane is to stay in the ai..
Find the work function of the emitting surface and the wavelength of the second source. Determine the net work done on the piano.
When a second pipe is played at the same time, a 1.40 Hz beat note is heard. By how much is the second pipe too long.
Two students are on a balcony 18.30 m above the street. One student throws a ball, b1, vertically downward at 16.80 m/s. At the same instant, the other student throws a ball, b2, vertically upward at the same speed.
As part of a safety investigation, two 1900 cars traveling at 25 are crashed into different barriers. Find out the average forces exerted on (a) car that hits a line of water barrels and takes 1.8 to stop, and (b) car that hits a concrete barrier an..
For safety in climbing, a mountaineer uses a nylon rope that is 69 m long and 1.0 cm in diameter. Whilst supporting a 96-kg climber, the rope elongates 1.4 m. Find its Young's modulus.
A professor's office door is 0.95 wide, 2.2 high, 4 thick; has a mass of 22 , and pivots on frictionless hinges. A "door closer" is attached to door and the top of door frame. When the door is open and at rest, the door closer exerts a torque of 5..
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