Search & Filtering
In 1920, a 6.5 × 104 kg meteorite was found in Africa. Suppose a meteorite with this mass enters Earth’s atmosphere with a speed of 1.0 km/s. What is the change in the meteorite’s momentum if an average constant force of −1.7 × 106 N acts on the meteorite for 30.0 s? How far does the meteorite travel during this time?
What is the velocity o π- meson whose proper means life time is 2.5× 10⅞ second
Interestingly, when the value of G was first measured, people all over the world were very excited because the mass of the earth can now be measured through Newton's law of universal gravitation. Using the radius of the earth, r = 6.40 X10 m, calculate its mass Consider a 1 Kg ball on the floor.
A student holds a tuning fork oscillating at 257 Hz. He walks toward a wall at a constant speed of 1.41 m/s.
(a) What beat frequency does he observe between the tuning fork and its echo?
(b) How fast must he walk away from the wall to observe a beat frequency of 4.90 Hz?
33 m/s
The wave function associated with standing waves established in a 4.00 m long string is
y = 0.00500 sin(πx)cos(150πt) where x and y are in meters and t is in seconds.
(a) How many half-wavelengths does this pattern exhibit?
(b) What is the fundamental frequency of vibration of the string (in Hz)?
c) If the original frequency is held constant and the tension in the string is increased by a factor of 4, how many half wavelengths are present in the new pattern?
Two cars, A and B, are held by the two pistons of a hydraulic press at the same
horizontal level. Car A weighs 3,400 N, and car B weighs 2,850 N. Calculate the
ratio between the area of the piston car A is sitting on and the area of the piston
car B is sitting on.
A block with mass M is at rest on a frictionless, horizontal surface. The block is attached to an ideal, massless spring that initially is in equilibrium.
A riffle bullet with mass mp is fired with speed vb into the block and embeds itself in the block. The impact compresses the spring over a distance D. The block and bullet oscillate in simple harmonic motion.
(a) Calculate the angular frequency ω of the oscillation.
(b) When time t=0 is defined as the instant of impact, the positive x-axis is pointing to the right, and x=0 is the initial position of the block before impact, give an expression x(t) for the time dependent position of the block and bullet. Assume that the impact itself takes no time.
1, A simple pendulum 0.4m long as a period of 1.3sec. what is the period of a similar pendulum 0.3m long in the same location.
The fan blades are rotating with an angular speed of -120 rad/s . As the plane takes off, the angular velocity of the blades reaches -390 rad/s in a time of 19s. Find the angular acceleration, assuming it to be constant.
TRUE or FALSE.
Inverse square law states that sound intensity is directly proportional to the square of the distance between the source and the listener.
