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A 10cm*10cm*10cm block of steel (ρ steel =7900kg/m^3) is suspended from a spring scale. The scale is in nektons.
1. What is the scale reading if the block is in air?
2. What is the scale reading after the block has been lowered into a beaker of oil (ρ oil = 900 kg/m^3) and is totally submerged?
A tennis ball is thrown straight up with an initial speed of 20 m/s, What is the ball's acceleration at its maximum height
A 30-dB sound wave and a 20dB sound wave simultaneously strike a sound detector with an area of 5*10-1 cm2. Find energy absorbed by the detector in 3 hours
A compact disc, initially at rest, is spun up to an angular velocity of 22 rad/s by a constant angular acceleration of 4.0 rad/s^2. How much time does the disk take to reach maximum velocity
A particle moving in a straight line with constant accelaration - Find the velocity of particle at the mid point of the path.
Four point charges are at the corners of a square of side a as shown in the figure below. Determine the magnitude and direction of the resultant electric force on q, with ke, q, and a left in symbolic form. (B = 1q and C = 5q. Let the +x-axis be poin..
A child holds a candy bar 10.0 cm in front of a convex mirror and notices that the image is only one-half the size of the candybar. What is the radius of curvature of the mirror?
A large balloon of mass 220 kg is filled with helium gas until its volume is 321 m3. Calculate the buoyant force acting on the balloon
Consider a balloon containing nitrogen molecules at room temperature (20°C) and atmospheric pressure. what is the number of molecules in the balloon
A small button placed on a horizontal rotating platform with diameter 0.324m will revolve with the platform when it is brought up to a rotational speed of 42.0rev/min , provided the button is a distance no more than 0.142m from the axis. Part A Wh..
A 5.60kg mass is pushed against a spring (k=2000N/m) such that the spring is compressed 12 cm. The mass is released, slides1.50m down the incline, along which μ=0.140. Decide the kinetic energy as it reaches level ground.
a space cowboy wants to eject from his spacecraft 1.60times105rm km after passing a space buoy as seen by spectators at
Find out the magnetic induction at a point
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