Get college assignment help at uniessay writers Determine how many calories of heat must be removed to change 100g of vapor at 240°C to solid at 20°C. Consider the following properties of the substance: heat of fusion 300 cal/g, heat of vaporization 600 cal/g, specific heat capacity as a liquid -0.75 cal/g-Co, melting point at 20°C and boiling point of 240°C.
I1-I2-I3 I4=0 -I1R1 V1-I2R2=0 I3R3-V2 I4R4=0 R2I2-R3I3=0 V1=1.5 V2=2.9 R1=20 R2=50 R3=40 R4=30
A charged particle moves in a region of uniform field along a helical path (radius = 1.0 cm, pitch = 8.0 cm) as shown. What is the angle between the velocity of the particle and the magnetic field
A herd of wild horses races across the flat, open plains of the Great Basin in central Nevada. If the horses are running at 12.1 m/s at a compass heading of 286 degrees, what is the northward component of their velocity?
The mass of a robot is 5200 kg. This robot weighs 3750 N more on planet A than it does on planet B. Both planets have the same radius of 1.33 107 m. What is the difference MA – MB in the masses of these planets?
A car of mass M = 1200 kg traveling at 65.0 km/hour enters a banked turn covered with ice. The road is banked at an angle theta, and there is no friction between the road and the car’s tires
consider a damped oscillator with fixed natural frequency wo and fixed damping constant B( not too large) that is driven by a sinusoidal force with variable frequency w. show that the amplitude of the response as given by A^2=(fo^2)/((wo^2-w^2)^2 4B^2w^2) is maximum when w=(wo^2 -2B^2)^1/2 note that so long as the resonance is narrow this implies w~wo
A large Foucault pendulum such as hangs in many science museums can swing for many hours before it damps out. Taking the decay time to be about 8 hours and length to be 30 meters fund the quality factor Q
n 8.00 g bullet is fired into a 190 g block that is initially at rest at the edge of a table of 1.00 m height. The bullet remains in the block, and after the impact the block lands d = 1.5 m from the bottom of the table. Determine the initial speed of the bullet.
A professor’s office door is 0.96 wide, 2.2 high, 4.0 thick; has a mass of 24 , and pivots on frictionless hinges. A “door closer” is attached to door and the top of the door frame. When the door is open and at rest, the door closer exerts a torque of 5.2 .
Get college assignment help at uniessay writers The 3.5 kg, 30-cm-diameter disk in the figure is spinning at 350 rpm. How much friction force must the brake apply to the rim to bring the disk to a halt in 2.4 s?
A box of mass 87 kg is at rest on a horizontal frictionless surface. A constant horizontal force then acts on the box, and accelerates it to the right. It is observed that it takes the box 3.7 seconds to travel 61 meters. What is the magnitude of the force?
A sports car claims that it can start from rest and reach 60 mph (26.8 m/s) in a distance of 33.5 meters. To reach its maximumm speed, it accelerates at this constant rate for 11.25 seconds. a) How many seconds does it take to reach 60 mph? – I got 1.25 seconds b) What is the maximum speed of this car? – Using kinematics I got 120.6 m/s c) If the mass is 1900 kg, what force must the car provide to keep it traveling at this maximum speed ( Hint: don’t forget friction) – I know that Fnet= mass x acceleration, and that gives me 1900 x 10.72 = 20,368 N but this is not taking into account friction. What role does friction play and how can I calculate it properly? d) I was driving this car at a maximum speed on a test track when a deer ran out in front of me. My reaction time was 0.5 seconds, before I hit the brakes. Assuming that the engine is no longer applying any forward force, and my wheels lock up, how far will I travel before I come to a stop after seeing the deer (give answer in miles, using: 1 Km = 0.62 miles)? e) How much time will elapse from the time that I see the deer until I stop?
In a steam radiator, steam at 110°C condenses and the liquid water formed is cooled to 80°C. How much heat per gram of liquid formed, is released in this process
How much heat is absorbed by a persons hand if 100 grams of liquid water at 100°C is poured on his hand? (Assume the final temperature of the water will be normal body temperature of 37°C) 7. How much heat is absorbed by a persons hand if 100 grams of steam at 100°C is first converted to liquid water at 100°C and then cooled to normal body temperature?
For the irreversible transition of: 100 g H2O (s, -25°C) → 100 g H2O (v, 120°C) Calculate the total amount of heat necessary to effect a set of reversible reactions for theses conditions.
In an EM wave traveling west, the field oscillates vertically and has a frequency of 89.0 and an rms strength of 6.80×10−9 .What is the frequency of the electric field?
An object with mass m1 = 4.00 kg, rests on a frictionless horizontal table and is connected to a cable that passes over a pulley and is then fastened to a hanging object with mass m2 = 8.0 kg, as shown in Figure P4.30. Find the acceleration of each object and the tension in the cable.
While running, a person dissipates about 0.593 J of mechanical energy per step per kilogram of body mass. If a 62.6 kg runner dissipates a power of 60.9 W during a race, how fast is the person running? Assume a running step is 1.50m in length
when a 120N bag of nails hangs motionless from a single vertical strand of rope how much tension is exerted in the strand?
What average force is needed to accelerate a 7.00-gram pellet from rest to 115 m/s over a distance of 0.600 m along the barrel of a rifle?
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