Get college assignment help at uniessay writers A 41.5 kg parachutist lands moving straight downward with a speed of 3.90 m/s. (a) If the parachutist comes to rest with constant acceleration over a distance of 0.710 m, what force does the ground exerts on her?
A baseball outfielder throws a 0.150 kg baseball at a speed of 43.0 m/s and an initial angle of 26.0°. What is the kinetic energy of the baseball at the highest point of its trajectory?
The coefficient of static friction between the m = 3.50 kg crate and the 35.0° incline of Figure P4.41 is 0.310. What minimum force must be applied to the crate perpendicular to the incline to prevent the crate from sliding down the incline? 1 N
Figure 5-34 shows three blocks being pushed across a frictionless floor by horizontal force F.
The angular speed of the shaft of a car’s engine is 113 rad/s. How many revolutions does it complete in 2.0 hours?
Moon effect. Some people believe that the Moon controls their activities. The Moon moves from being directly on the opposite side of Earth from you to be being directly overhead. Assume that the Earth-Moon (center-to-center) distance is 3.82 108 m and Earth’s radius is 6.37 106 m. (a) By what percent does the Moon’s gravitational pull on you increase? (b) By what percent does your weight (as measured on a scale) decrease?
A 2400 kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 3.00 m before coming into contact with the top of the beam, and it drives the beam 13.0 cm farther into the ground before coming to rest. Using energy considerations, calculate the average force the beam exerts on the pile driver while the pile driver is brought to rest
A 320 kg load is hung on a wire of length 5.4 m and cross sectional area 3.8 × 10^−5 m^2 , What is its increase in length? The ac- celeration of gravity is 9.8 m/s^2 and Young’s modulus is 8.2 × 10^10 N/m^2 . Answer in units of mm. Round to three decimals places.
What increase of pressure is required to change the volume of a sample of water by 0.792%? The bulk modulus is 2.1 × 10^9 Pa. Answer in units of Pa. Round to three decimal places.
Copper has a breaking stress of about 3 × 10^8 N/m^2. A. What is the maximum load that can be hung from a copper wire of diameter 0.46 mm? Answer in units of N B. If 30% of this maximum load is hung from the copper wire, by what percentage of its length will it stretch? Answer in units of %.
Get college assignment help at uniessay writers A 25.0- crate is pulled northward at a constant speed of 20.0 . One of the forces acting on the block acts in a direction 60.0 east of north and has magnitude 15.0 .
2) Fiber consisting of flint glass (nflint = 1.667) surrounded by a cladding made of crown glass (ncrown = 1.523). A beam of light enters the fiber from air at an angle Ѳ1 with respect to the normal. What is Ѳ1 if the light strikes the core- cladding interface at the critical angle?
A child goes down a playground slide with an acceleration of 1.14 m/s^2 .Find the coefficient of kinetic friction between the child and the slide if the slide is inclined at an angle of 28.0 below the horizontal.
An electric motor rotating a workshop grind- ing wheel at a rate of 227 rev/min is switched off. Assume constant angular deceleration of magnitude 2.72 rad/s2. Through how many revolutions does the wheel turn before it finally comes to rest? Answer in units of rev.
In a performance test, each of two cars takes 8.6 s to accelerate from rest to 24 m/s. Car A has a mass of 1288 kg, and car B has a mass of 1805 kg. Find the net average force that acts on (a) car A and (b) car B during the test.
What is the maximum speed with which a 1050- car can round a turn of radius 77 on a flat road if the coefficient of static friction between tires and road is 0.90?
The modern standard of length is 1 m and the speed of light is approximately 2.99792 × 108 m/s . Find the time t for light to cover 1 m at the given speed.
A baseball player pitches a fastball toward home plate at a speed of 43 m/s. The batter swings, connects with the ball of mass 143 g, and hits it so that the ball leaves the bat with a speed of 38 m/s. Assume that the ball is moving horizontally just before and just after the collision with the bat.
A metal rod of length 2.0 m is moved at 6.0 m/s in a direction perpendicular to its length. A 5.0e-3 T magnetic field is perpendicular to both the rod and its velocity. If the resistance of the rod is 15e-3 Ohms, what is the current inthe rod? Ans: 0 A .. but I don’t know why. I keep getting 4 A by using the equation: I=vBL/R
A Federation starship (2.0 106 kg) uses its tractor beam to pull a shuttlecraft (4.0 104 kg ) aboard from a distance of 20 km away. The tractor beam exerts a constant force of 4.0 104 N on the shuttlecraft. Both spacecraft are initially at rest. How far does the starship move as it pulls the shuttlecraft aboard?
A bucket filled with water has a mass of 64.9 kg and is attached to a rope that is wound around a 0.4 m radius cylinder. What torque does the bucket produce around the center of the cylinder?
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