Get college assignment help at uniessay writers Find the magnitude of the impulse delivered to the particle. Express your answer in terms of and . Use three significant figures in the numerical coefficient.
How much heat is needed for the following conversion? 200 g of liquid H2O at 50 °C is heated to form 200 g of steam at 120 °C.
he left side of the figure shows a light (`massless’) spring of length 0.300 m in its relaxed position. It is compressed to 73.0 percent of its relaxed length, and a mass M= 0.130 kg is placed on top and released from rest. The mass then travels vertically and it takes 1.30 s for the mass to reach the top of its trajectory. Calculate the spring constant, in N/m. (Use g=9.81 m/s2). Assume that the time required for the spring to reach its full extension is negligible.
Two packing crates of masses 10.0 kg and 5.00 kg are connected by a light string that passes over a frictionless pulley. The 10kg crate hangs vertically and the 5.00-kg crate lies on a smooth incline of angle 40.0°. Find the acceleration of the 5.00-kg crate. Record only the tension in the string.
A flywheel in the form of a heavy circular disk of diameter 0.819 m and mass 199 kg is mounted on a frictionless bearing. A motor connected to the flywheel accelerates it from rest to 803 rev/min. What is the moment of inertia of the fly- wheel? Answer in units of kg · m2.
A quarterback takes the ball from the line of scrimmage, runs backward for 14 yard, then runs parallel to the line of scrimmage for 11 yard. At this point, he throws a 39 yard forward pass straight down field, perpendicu- lar to the line of scrimmage. What is the magnitude of the football’s resultant displacement? Answer in units of yards.
A football coach sits on a sled while to of his players build their strength by dragging the sled across the field with ropes. The friction force in the sled is 1000N and the angle between the two ropes is 20 degrees. How hard must each player pull to drag the coach at a steady 2.0 m/s ?
1. An archer pulls her bowstring back 0.400 m by exerting a force that increases uniformly from zero 230 N. (a) What is the equivalent spring constant of the bow? (b) How much work does the archer do in drawing the bow? (c) If the arrow, which has a mass of 0.05 kg, left the bow with a speed of 50.0 m/s, what is its kinetic energy?
A charged particle m=6g q=-80 c moves in a region of uniform field along a helical path (radius = 3.0 cm, pitch = 9.0 cm) as shown. What is the angle between the velocity of the particle and the magnetic field?
Columnist Dave Barry poked fun at the name “The Grand Cities,” adopted by Grand Forks, North Dakota, and East Grand Forks, Minnesota. Residents of the prairie towns then named a sewage pumping station for him. At the Dave Barry Lift Station No. 16, untreated sewage is raised vertically by 5.49 m in the amount of 1 890 000 liters each day. With a density of 1 050 kg/m3, the waste enters and leaves the pump at atmospheric pressure through pipes of equal diameter. (a) Find the output power of the lift station. (b) Assume that a continuously operating electric motor with average power 5.90 kW runs the pump. Find its efficiency.
Get college assignment help at uniessay writers A 60 kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 1.3 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.
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 box of textbooks of mass 24.7 kg rests on a loading ramp that makes angle a with the horizontal. The coefficient of kinetic friction is .25 and the coefficient of static friction is .37. Find the minimum angle at which the box starts to slip.
A charged particle moves in a region of uniform field along a helical path (radius = 1.0 cm, pitch = 6.0 cm) as shown. What is the angle between the velocity of the particle and the magnetic field?
A uniform plank of length 6.0 m and weight 214 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support (see the drawing).
An ac generator has a frequency of 2.4 kHz and a voltage of 240 V. An inductance L1 =6.0 mH is connected across its terminals. Then a second inductance L2 =10 mH is connected in parallel with L1. Find (a) the current that the generator delivers to L1 and (b) to the parallel combination.
A Cessna aircraft has a lift-off speed of 130 km/h. What minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 200 m? Answer in units of m/s2.
A space traveler weighs 550 N on earth. What will the traveler weigh on another planet whose radius is three times that of earth and whose mass is twice that of earth?
A soccer ball of diameter 29 cm rolls without slipping at a linear speed of 2.0 m/s. Through how many revolutions has the soccer ball turned as it moves a linear distance of 21 m?
An 79-kg stuntman jumps from a window of a building situated 33 m above a catching net. Assuming that air resistance exerts a 100-N force on the stuntman as he falls, determine his velocity just before he hits the net.
a person pulls on a 50Kg desk with a 200N force acting at 30 angle above the horizontal. the desk does not budge. draw a force diagram for the desk. a) write the equation that describes the forces which act in the x-direction. b) write the equetoion whicch describes the forces which act in the y-direction. c) determin the x and y components of the force of tension d) determine the value of the frictional force. do the same for the normal force
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