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You are trying to slide a refrigerator across a horizontal floor. The mass of the refrigerator is 188 kg, and you need to exert a force of 347 N to make it just begin to move. What is the coefficien
A football player runs directly down the field for 35m before turning to the right at and angle of 225 degrees from his original direction and running an additional 15m before getting tackled. What
The temperature is kept at 3 degrees Celsius. How much heat is transferred from the water to cool it to 3 degrees Celsius?
A 0.45-kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.3m on a frictionless horizontal surface. If the cord will break when the tension in it exceeds 75N, what
You place one end of the pole on a fence post and hold the other end of the pole 35cm from its tip. How much force must you exert to keep the pole motionless and horizontal?
what maximum height above the ground will the rocket achieve? The acceleration of gravity is 9.8 m/s2 . Answer in units of km.
In terms of A_1, what is the amplitude for the same driving frequency and the same driving force amplitude F_{max}, if the damping constant is 3b_{1}?
The initial height of the block is 0.5 m above the lowest part of the slide and the spring constant is 450 N/m.(a) What is the block's speed when it is at a height of 0.25 m above the base of the slid
A charge of 1.50×10-8 C lies on an isolated metal sphere of radius 16 cm. With V = 0 at infinity, what is the electric potential at points on the sphere's surface?
A 0.25 kg length of aluminum wire is warmed 10.0°C by an electric current. How much heat was generated by the current?
The objects are released from rest, and m2 slides 1.00m down the incline in 4.00s. Determine (a) the acceleration of each object, (b) the tension in the string, and (c) the coefficient of kinetic fr
Two 9.0 cm diameter charged disks face each other, 25 cm apart. Both disks are charged to - 80 nC. What is the electric field strength at the midpoint between the two disks?
A gas expands when 619 J of energy is added to it by heat. The expanding gas does 442 J of work on its surroundings. What is the overall change in the internal energy of the gas? Answer in units of
The 22 cm long gardening tool shown here is used to pull weeds. If a 1.23 N•m torque is required to pull a given weed, what force did the weed exert on the tool?
A spring is stretched as shown at right and released at position x=0.1m at time t=0. The mass is 3kg and the spring constant is given by k=27N/m. Assume a frictionless system. (a) Find the angular f
A simple generator has a 620-loop square coil 21.0 cm on a side. How fast must it turn in a 0.690 T field to produce a 140 V peak output?
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