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An object undergoes projectile motion where friction is negligible and the acceleration due to gravity g is constant. If the object's initial velocity was at an angle (< 90 degrees) above the horizontal, when it gets to the highest point in its path
A. its speed is zero.
B. its velocity is zero.
C. its acceleration is zero.
D. the magnitude of its acceleration is g.
Light of wavelength 655 nm is used to illuminate normally two glass plates 20 cm in length that touch at one end, How many bright fringes appear along the total length of the plates
You are walking around your neighborhood and you see a child on top of a roof of a building kick a soccer ball. How tall is the building that the child is standing on
A yo-yo has a rotational inertia of 910 g·cm2 and a mass of 120 g. Its axle radius is 3.8 mm and its string is 100 cm long. The yo-yo is thrown so that its its initial speed down the string is 1.1 m/s.
The radius of a proton is 0.9e-15 m; suppose that if the particles touch, the distance between their centers will be twice that. What will be the total kinetic energy of both particles an instant before they touch.
A boy with a mass of 55 kg is hanging from a spring with a spring constant of 240 N/m. With what frequency does the boy bounce up and down
A person can be killed if a current as small as 50 mA passes near the heart. An electrician is working on a humid day with hands damp from perspiration. What potential difference between the two wires
Determine the value of the electric potential. calculate the acceleration of the ball when it is 3 cm from the surface and again at the position determined in part b.
A jet with mass m = 1.3 × 105 kg jet accelerates down the runway for takeoff at 2.4 m/s2, What is the net vertical force on the airplane as it levels off
A 500 Hz whistle is moved toward a listener at a speed of 10 m/s. At the same time, What is the apparent frequency heard by the listener
The differential gear of a car axle allows the wheel on the left side of a car to rotate at a different angular speed than the wheel on the right side. A car is driving at a constant speed around a circular track on level ground, completing each l..
A clown is using a concave makeup mirror to get ready for a showand is 27.9 cm in front of the mirror. The image is 66.1cm behind the mirror. Calculate the focal length of the mirror.
A stone is thrown from the top of a cliff 150 m above the ground, What is the speed (magnitude of velocity) of the stone when it hits the ground
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