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Q. A constant force of 105 N, directed upward, is applied to a 3.9 Kg toy rocket by the rocket's engine. what is the rockets acceleration?
Q. A 1.5 kg copper block is given an initial speed of 3.0 m/s on a rough horizontal surface. Because of friction, the block finally comes to test. If the block absorbs 85% of its kinetic energy, calculate its increase in temperature.
A wooden raft has a mass of 76 kg. When empty it floats in water (density 1000 kg/m3) with 51 percent of its volume submerged. What mass of sand can be put on the raft without it sinking.
A hot wheels track has a spring loaded launcher. A 100g car is pushed into the launcher, which compresses the spring by 2cm. The cars initial velocity after launching is 3m/s.
Describes possible scenarios among following
A simple harmonic oscillator consists of a block of mass 4.kg attached to a spring of spring constant 153 N/m. When t = 2 s, the position and velocity of the block are x = +0.129 m and v = +3.415 m/s.
If a metal wire carries a current of 23.0 mA, how long does it take for 12.0×1020 electrons to pass a given cross-sectional area anywhere along the wire? The magnitude of the charge on an electron is 1.6 × 10-19 C.
A copper strip (n = 8.47 1022 electrons per cubic centimeter) 2 cm wide and 0.07 cm thick is used to measure the magnitudes of unknown magnetic fields that are perpendicular to the strip. Find out the magnitude of B for the following Hall voltages..
Objects with masses of 145kg and a 445kg are separated by 0.330m. At what position (other than infinitely remote ones) can the 32kg object be placed so as to experience the net force of zero.
The reflected sound is afterwards mixed with the transmitted sound, and 85 beats per second are detected. The speed of sound in body tissue is 1520m/s. compute the speed of the fetal heart wall at the instant this measurement is made.
What is the magnitude of the electric field at this point?
An electronic device dissipating 30 W has a mass of 20g and a specific heat of 850 J/kgoC. The device is lightly used, and it is on for 5 min and then off for several hours, throughout which it cools to the ambient temperature of 25 o C.
Two pellets, each with charge 5 microcoulomb (1 microcoulomb = 0.000001 coulombs), are located 0.5 m apart. What is electrical force between the charges.
A .300kg mass attached to the end of a .75m string is whirled around on a smooth level table. If the maximum tension that the string can withstand is 250N, then what most tangential speed can the mass have if the string is not to break.
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