Get college assignment help at uniessay writers Rotating Bar. A thin, uniform 12.0-kg bar that is 2.00 m long rotates uniformly about a pivot at one end, making 5.00 complete revolutions every 3.00 seconds.
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.
A 1.27-kg block slides across a rough surface such that it slows down with an acceleration of 1.40 m/s2. What is the coefficient of kinetic friction between the block and the surface?
A race car has a mass of 701 kg. It starts from rest and travels 42.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?
A 1.0 kg glass bowl at 37 °C is placed in a freezer. How much heat will the freezer have to remove from the bowl to take it to 0 °C? (cglass = 0.2 cal/deg-gm)
How much heat must be removed from 500 g of water at 0 °C to form ice at 0 °C?
How much heat is necessary to vaporize 100 g of water at 100 °C to form steam at 100 °C?
How much heat must be added to 1.0 kg of iron to raise its temperature from 30 °C to 75 °C? (ciron = 0.11 cal/deg-gm)
An electric motor rotating a workshop grinding wheel at a rate of 109 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 2.00 rad/s2.
A baseball outfielder throws a 0.150 kg baseball at a speed of 35.0 m/s and an initial angle of 26.0°. What is the kinetic energy of the baseball at the highest point of its trajectory?
Get college assignment help at uniessay writers A shop sign weighing 235 N is supported by a uniform 110 N beam as shown in the figure. Find the tension in the guy wire
A spring with 58 hangs vertically next to a ruler. The end of the spring is next to the 11- mark on the ruler. If a 2.5- mass is now attached to the end of the spring, where will the end of the spring line up with the ruler marks?
“A cylinder with moment of inertia 29.8 kgm2 rotates with angular velocity 2.51 rad/s on a frictionless vertical axle. A second cylinder, with moment of inertia 36.9 kgm2, initially not rotating, drops onto the first cylinder and remains in contact. Since the surfaces are rough, the two eventually reach the same an- gular velocity. Calculate the final angular velocity. Answer in units of rad/s.”
11. A 0.302 kg puck, initially at rest on a horizon- tal, frictionless surface, is struck by a 0.177 kg puck moving initially along the x axis with a speed of 2.38 m/s. After the collision, the 0.177 kg puck has a speed of 1.38 m/s at an angle of 27◦ to the positive x axis. Determine the velocity of the 0.302 kg puck after the collision. Answer in units of m/s.
A machine part rotates at an angular speed of 0.6 rad/s; its speed is then increased to 1.66 rad/s using an angular acceleration of 0.91 rad/s2. Find the angle through which the part ro- tates before reaching this final speed. Answer in units of rad.
you are driving home from school steadily at 95 km/h for 130 km. it begins to rain and you slow down to 65 km/h. you arrive home after driving 3 hours and 20 minutes. A)how far is hometown from school. B)what was your average speed
Two forces, and , act at a point, as shown in the picture. has a magnitude of 9.00 and is directed at an angle of = 62.0 above the negative x axis in the second quadrant. has a magnitude of 6.40 and is directed at an angle of = 52.4below the negative x axis in the third quadrant.
In the vertical jump, a Kobe Bryant starts from a crouch and jumps upward to reach as high as possible. Even the best athletes spend little more than 1.00s in the air (their “hang time”). Treat Kobe as a particle and let ymax be his maximum height above the floor. Note: this isn’t the entire story since Kobe can twist and curl up in the air, but then we can no longer treat him as a particle. To explain why he seems to hang in the air, calculate the ratio of the time he is above ymax/2 moving up to the time it takes him to go from the floor to that height. You may ignore air resistance.
What is the impulse provided by the racket on a tennis ball (0.058 kg) served at 52 m/s?
ronman steps from the top of a tall building. He falls freely from rest to the ground a distance of h. He falls a distance of h/ 3 in the last interval of time of 1.2 s of his fall. Hint: First, compute the velocity when Ironman reaches the height equal to the distance fallen. This requires that you do the following: define origin as the bottom of the building. Then use x-x0 = -v0*(t-t0)-(1/2)g(t-t0)^2 where x=0 and x0= (distance fallen) and t-t0 is the time interval given. In this formulation, you are going to get magnitude of v0 since you already inserted the sign. You then insert v0 that you just calculated into the kinematic equation that involves v, g, and displacement (v^2-v0^2 = 2g(height-(distance fallen)), but now v (which is the final velocity is v0 from above) and v0 in this case is the velocity that the Ironman has when he begins to fall, which is 0. This gives a quadratic equation for height h, and you will need to use the binomial equation to solve for h. Choose the larger of the two solutions. What is the height h of the building? Express your answer using two significant figures. h =? m
7) Two blocks are connected by a string, as shown in the figure . The smooth inclined surface makes an angle of 35 degrees with the horizontal, and the block on the incline has a mass of 5.7 kg . The mass of the hanging block is m= 2.9kg. Find the direction of the hanging block’s acceleration. Find the magnitude of the hanging block’s acceleration.
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