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A 360 kg bear grasping a vertical tree slides down at constant velocity. What is the friction force that acts on the bear?
The period of the planet's motion about the star is 658 days. What is the mass of the star? The value of the universal gravitational constant is 6.67259 × 10-11 N · m2/kg2.
a ball is dropped from the top of a 50 meter high cliff. At the same time, a carefully aimed stone is thrown straight up from the bottom of a cliff w/ a speed of 24 meter/sec. The stone and ball col
A cat rides a merry-go-round while turning with uniform circular motion. At time t1 = 2.00 s, the cat's velocity is v1 = (6.50) ihat + (4.00 m/s) jhat, measured on a horizontal xy coordinate system
If the decibel level is 0 dB at a distance of 1.0 m from the door, at what distance is the music just barely audible to a person with a normal threshold of hearing?
A car crashes into a wall at 50 m/s and is brought to rest in 0.1 s. Calculate the average force exerted on a 85 kg test dummy by the seat belt.
you swing a 3.00kg stone in a circle, using the full length of a thin 70.0 cm rope. at what speed should you swing it so its acceleration will be 9.8 m/s/s.
The entire system is initially rotating at 0.180. Find the angular velocity if the child moves to a final position 1.10 from the center of the merry-go-round.
The coefficients of static and kinetic friction for plastic on wood are 0.50 and 0.40, respectively. How much horizontal force would you need to apply to a 3.0 N plastic calculator to start it movin
A force vector has a magnitude of 590 newtons and points at an angle 44o of below the positive x axis. What are (a) the x scalar component and (b) the y scalar component of the vector?
A 11 g bullet is fired into a 12 kg wood block that is at rest on a wood table. The block, with the bullet embedded, slides 5.0 {rm cm} across the table. The coefficient of kinetic friction for woo
The boomhangs at angle 58 above the horizontal, and the cable is per- pendicular to the boom. An object of weight 2159 N hangs on another cable attached to the boom's free end. Find the tension T i
At one instant, the center of mass of a system of two particles is located on the x-axis at x = 2.0 {rm{ m}} and has a velocity of (5.0 {rm{ m/s}} ) hat i. One of the particles is at the origin. The
An airplane is flying with a velocity of 88.0 at an angle of 22.0 above the horizontal. When the plane is a distance 119 directly above a dog that is standing on level ground, a suitcase drops out
One is traveling at 0.550c and the other at 0.750c. The satellites collide and stick together. What is the speed of the combined object after the collision?
A rectangular air mattress is 2.64 m long, 0.669 m wide, and 0.0357 m thick. If it has a mass of 2.52 kg, what additional mass can it support in water? The acceleration of gravity is 9.8 m/s 2. Answ
A long pole is used to lift a window. If a vertical lift of 85 N is needed to raise the window, what force must be exerted along the pole? Assume the pole makes an angle of 49° with the vertical
What is the other particle? Enter the mass number in the first raised box, the atomic number in the second lower box, and the element, with charge if necessary, in the third box.
A 0.225 kg sample of tin initially at 20 degrees celsuis is dropped into 0.115 kg of water. If the specifc heat capacity of tin is 230 J/kg times degrees celsuis, what is the change in temperature
48 g tennis ball horizontally from rest to a speed of 35 m/s Assuming that the acceleration is uniform when the racquet is applied over a distance of 0.52 m, what is the magnitude of the force exert
An 84 kg man drops from rest on a diving board -3.4 m above the surface of the water and comes to rest 0.58 s after reaching the water. The acceleration due to gravity is9.81 m/s 2 . What forc
A support strap is attached to the patient's ankle 13.0 from the bottom of his foot. What weight is needed to support the leg horizontally?
A portion of an electric circuit connected to a 60 ohm resistor is embedded in 0.50 kg of a solid substance in a calorimeter. calculate the current in the resistor.
An electron is accelerated from rest by a potential difference of 310 V. It then enters a uniform magnetic field of magnitude 270 mT with its velocity perpendicular to the field. Calculate the speed
A bat emits a sound whose frequency is 70.8 kHz. The speed of sound in air at 20.0 oC is 343 m/s. However, the air temperature is 42.2 oC, so the speed of sound is not 343 m/s. Assume that air beha