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1. A proton with a speed of 4.5 x 10^6 m/s is observed to travel in a circle of radius 0.22m in a magnetic field. What is the strength of the magnetic field?
A. 2.3 x 10^-2 TB. 2.1 x 10^-1 TC. 4.7 TD. 1.1 x 10^5 T
2. A 56V DC motor draws a 2.0A when running at full speed. If the resistance of the armature is 1.5 ohms, what is the back emf (reverse voltage) at this speed?
A. zeroB. 3.0 VC. 53 VD. 59 V
3. An ideal transformer is being designed to change a 640 V AC into 120 V AC. What should be the ratio of the number of turns on the primary coil to the number of turna on the secondary coil?
A. 0.035B. 0.19C. 5.3D. 28
Light from a sodium lamp (λ =589 nm) illuminates two narrowslits. The fringe spacing on a screen 150 cm behind the slit is 4.0mm. What is the spacing (in mm) between the two slits?
A new General Electric kitchen stove has a mass of 68kg and the dimensions. The stove comes with a warning that it can tip forward if the person stands or sits on oven door when it is open.
A chair of weight 85.0N lies atop a horizontal floor; the floor is not frictionless. Using Newton's laws, calculate n, the magnitude of the normal force that the floor exerts on the chair
Suppose a heat engine has an efficiency of 0.201 and produces 1.09×104 J of work. How much energy is pulled in from the hot reservoir? How much energy is rejected by the engine? (This energy is "exhausted" to the cold reservoir.))
a parallel plate capacitor has a capacitance of 3.0 microf when filled with a dielectric. the area of each plate is 3.7
What is the electric field strength at midpoint between two disks.What is the electric field strength a point on axis 5.0 cm from one disk between them.
Light, which consists of linearly polarized and unpolarized components, is incident on a polarizing sheet.
Presume we wish to curve a physics test using a linear function. If we want to scale the scores upwards we may decide to raise the lowest score of 47 to 65 and the highest score of 78 to 90. Find a linear equation that converts the other test scores.
A wave on a string has a speed of 397 m/s. If the tension in the string is 128 N and its length is 1.9 m, what is the mass of the string
In a model AC generator a 502 turn rectangular coil 8 centimeter by 20 cm rotates at 123 rpm in a uniform magnetic field of 0.62T, Obtain the maximum emf induced in the coil
part 1 rc circuit 5 identical resistors with resistance r are connected in series while 5 identical capacitors with
A burning firecracker is tossed into the air at an angle of 60 degrees up from the horizon. If it leaves the hand of the hurler at the speed of 30 m/s, how long should the fuse be set to burn if the explosion is to occur 20 m away. Ignore friction..
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