# A 2000 kg car is traveling at a velocity of 30

Get college assignment help at uniessay writers A 2000 kg car is traveling at a velocity of 30 m/s when suddenly a deer runs in front of it. Stomping on your breaks the car stops 60 m from its original location. What was the kinetic force of friction?

## A 102.0 N grocery cart is pushed 13.0 m by a

A 102.0 N grocery cart is pushed 13.0 m by a shopper who exerts a constant horizontal force of 54.0 N. If all frictional forces are neglected and the cart starts from rest, what is its final speed?

## A sphere of radius a is made by joining two conducting

A sphere of radius a is made by joining two conducting hemispheres along their equators. The hemispheres are electrically insulated from one another and maintained at two different potentials V1 and V2. a) Starting from the general expression V (r, ) = X1 l=0 alrl bl rl 1 Pl(cos ) find an integral expression for the coefficients al, bl that are relevent to the electric field outside the sphere. Evaluate the integrals giving b1, b2 and b3. b) Use your results from part a) to compute the electric dipole moment of the sphere as function of the potential difference V1 − V2. c) Now the two hemispheres are electrically connected and the entire surface is at one potential. The sphere is immersed in a uniform electric field E. What is its dipole moment now?

## Consider a region in space where a uniform electric field =

Consider a region in space where a uniform electric field = 6310 N/C points in the negative direction. What is the distance between the 13.5 V and the 14.5 V equipotentials?

## A charge of 3.06 uC is held fixed at the origin.

A charge of 3.06 uC is held fixed at the origin. A second charge of 3.06 uC is released from rest at the position (1.05 m, 0.506 m). If the mass of the second charge is 2.73 g, what is its speed when it moves infinitely far from the origin? B)at what distance from the origin does the 3.06 uC charge attain half the speed it will have at infinity?

## A 86 kg water skier floating in a lake is pulled

A 86 kg water skier floating in a lake is pulled from rest to a speed of 14 m/s in a distance of 25 m. What is the net force exerted on the skier, assuming his acceleration is constant?

## If you weigh 675 {rm N} on the earth, what would

If you weigh 675 {rm N} on the earth, what would be your weight on the surface of a neutron star that has the same mass as our sun and a diameter of 17.0 {rm km}? Take the mass of the sun to be m_s = 1.99×1030 {rm kg}, the gravitational constant to be G = 6.67×10−11 {rm N} cdot {rm m^2/kg^2}, and the acceleration due to gravity at the earth’s surface to be g = 9.810 {rm m/s^2}.

## A mobile consisting of four weights hanging on three rods of

A mobile consisting of four weights hanging on three rods of negligible mass. Find the weight of W3. Answer in units of N.

## Two weights attached to a uniform beam of mass 23 kg

Get college assignment help at uniessay writers Two weights attached to a uniform beam of mass 23 kg are supported in a horizontal po- sition by a pin and cable as shown in the figure. What is the tension in the cable which sup- ports the beam? The acceleration of gravity is 9.8 m/s2 . Answer in units of kN.

## A weight (with a mass of 69 kg) is suspended from

A weight (with a mass of 69 kg) is suspended from a point near the right-hand end of a uni- form boom with a mass of 72 kg . To support the uniform boom a cable runs from this same point to a wall (the left-hand vertical coordi- nate in the figure) and by a pivot on the same wall at an elevation of 4 m. Calculate the tension T in the cable. The acceleration of gravity is 9.8 m/s2 . Answer in units of N.

## A 1.00-kg beaker containing 1.80 kg of oil (density = 916

A 1.00-kg beaker containing 1.80 kg of oil (density = 916 kg/m3) rests on a scale. A 1.90-kg block of iron is suspended from a spring scale and is completely submerged in the oil (see figure below). Find the equilibrium readings of both scales.

## A wrecking ball (weight = 4400 N) is supported by a

A wrecking ball (weight = 4400 N) is supported by a boom, which may be assumed to be uniform and has a weight of 3000 N. As the drawing shows, a support cable runs from the top of the boom to the tractor. The angle between the support cable and the horizontal is 32°, and the angle between the boom and the horizontal is 48°.

## Calculate the magnitude of the magnetic field at a point 139

Calculate the magnitude of the magnetic field at a point 139 cm from a long, thin conductor carrying a current of 0.611 A. The permeabil- ity of free space is 1.25664 × 10−6 T · m/A.

## f a curve with a radius of 85 is properly banked

f a curve with a radius of 85 is properly banked for a car traveling 67 , what must be the coefficient of static friction for a car not to skid when traveling at 97 ?

## Suppose the roller coaster in Fig. 6-38 (h1 = 37 m,

Suppose the roller coaster in Fig. 6-38 (h1 = 37 m, h2 = 11 m, h3 = 30) passes point A with a speed of 1.20 m/s. If the average force of friction is equal to one sixth of its weight, with what speed will it reach point B? The distance traveled is 60.0 m.

## a 2200 kg suv traveling at 94 km/h can be stopped

a 2200 kg suv traveling at 94 km/h can be stopped in 0.21 seconds if it hits a concrete wall. the velocity of the person equals that of the car both before and after the crash, and the velocity changes in .21 seconds. what is the average force exerted on the person?

## Suppose the roller coaster in Fig. 6-38 (h1 = 38 m,

Suppose the roller coaster in Fig. 6-38 (h1 = 38 m, h2 = 12 m, h3 = 25) passes point A with a speed of 2.20 m/s. If the average force of friction is equal to one fifth of its weight, with what speed will it reach point B? The distance traveled is 35.0 m

## 20. [1 point, 10 tries] A 1.84 kg rock is dropped

20. [1 point, 10 tries] A 1.84 kg rock is dropped onto a spring from a height of 0.387 m. If the spring constant is 1934 N/m, what is the maximum compression of the spring?

## If a curve with a radius of 85 m is properly

If a curve with a radius of 85 m is properly banked for a car traveling 68 km/h, what must be the coefficient of static friction for a car not to skid when traveling at 97 km/h?

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