Get college assignment help at uniessay writers stock system name for cr(oh)2,cuf2 ,aubr3
A 52 kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 1.0 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.
A 295 kg piano slides 4.2 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40. Calculate the force exerted by the man.
while jumping on a trampoline, a child reaches a high point of 5m above the trampoline surface. From there, the child falls back to the trampoline. The trampoline stretches 0.5m until the child comes to a momentary stop. Assume that once the child strikes the surface of the trampoline he experiences a constant deceleration . What is the magnitude of the childs deceleration due to the trampoline stopping his fall?
If a projectile is launched vertically from the Earth with a speed equal to the escape speed, how far from the Earth’s center is it when its speed is 1/7 of the escape speed?
A uniform beam of length L = 7.00 m and weight 3.70 102 N is carried by two workers, Sam and Joe, as shown in the figure below. Determine the force that each person exerts on the beam
You push a 1.8 kg block against a horizontal spring, compressing the spring by 26 cm. Then you release the block, and the spring sends it sliding across a tabletop. It stops 90 cm from where you released it. The spring constant is 370 N/m. What is the coefficient of kinetic friction between the block and the table?
A 89 kg astronaut and a 1200 kg satellite are at rest relative to the space shuttle. The astronaut pushes on the satellite, giving it a speed of 0.24 m/s directly away from the shuttle. Seven-and-a-half seconds later the astronaut comes into contact with the shuttle. What was the initial distance from the shuttle to the astronaut?
A woman holds a 2 m long uniform 10 kg pole. Determine the forces she must exert with each hand (magnitude and direction)
two forces act on an object. a 36 N force acts at 225 degrees a 48 N force acts at 315 degrees. what is the magnitude and direction of their equilibrant?
Get college assignment help at uniessay writers A 10 kg bullet is fired horizontally into a 300g wooden block initially at res on a horizontal surface andbecome embedded in it. The coefficient of friction between block and surface is (0.50). The combined system slides 4.0m before stopping. With what speed did the bullet strike the block?
A rectangular block of ice 9 m on each side and 1.6 m thick floats in sea water. The density of the sea water is 1025 kg/m3. The density of ice is 917 kg/m3. How many penguins of mass 22 kg can stand on the ice before they get their feet wet?
A 255 kg piano slides 4.5 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40.
how do I solve this problem? On an amusement park ride, passengers are seated in a horizontal circle of radius 7.5m. The seats begin from rest and are uniformly accelerated for 21 seconds to a maximum rotational speed of 1.4 rad/s. What is the instantaneous tangential speed of the passengers 15 s after the acceleration begins?
A 2200-kg sport utility vehicle traveling at 80 km/h can be stopped in 0.15 s if it hits a concrete wall. Assume a 60 kg person was in the car that hit this wall. The velocity of the person equals that of the car both before and after the crash, and the velocity changes in 0.15 s. (a) What is the average force exerted on the person? (b) Some people think that they can stop themselves rushing forward by putting their hands on the dashboard. Find the mass of the object that has a weight equal to the force you just calculated. Could you lift such a mass? Are you strong enough to stop yourself with your arms?
A 62-kg skier is going down a slope oriented 33° above the horizontal. The area of each ski in contact with the snow is 0.13 m2. Determine the pressure that each ski exerts on the snow.
a hawk flies in a horizontal arc of radius 12 m at a constant speed of 4 m/s. find its centripetal acceleration. it continues to fly along the same horizontal arc but steadily increases its speed at the rate of m/s^2. Find the acceleration (magnitude and direcetion) under these conditions.
an astronaut has a mass of 55 kg. While in orbit, a measurement determines that a force of 108 N causes her to move with an acceleration of 1.90 m/s2.
A container of volume 23.0 cm3 is initially filled with air. The container is then evacuated at 0oC to a pressure of 30 mPa. How many molecules are in the container after evacuation if we assume that air is an ideal gas?
You are to connect resistors R1 and R2, with R1 > R2, to a battery, first individually, then in series, and then in parallel. Rank those arrangements according to the amount of current through the battery, greatest first. (Use only the symbols > or =, for example series>R1=R2>parallel.)
A small-diameter inductor with self- inductance Ls and a large-diameter inductor with self-inductance Lℓ are connected in se- ries as shown in the figure. Consider the two inductors to be far apart. Thus, the mutual inductance between the two inductors is 0. Determine the equivalent self-inductance for the system.
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