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1.A baseball pitcher brings his arm forward during a pitch, rotating

Question 1.A baseball pitcher brings his arm forward during a pitch, rotating the forearm about the elbow. If the velocity of the ball in the pitcher’s hand is 33.5 m/s and the ball is 0.390 m from the elbow joint, what is the angular velocity (in rad/s) of the forearm?

In a downhill ski race, surprisingly, little advantage is gained by
Question In a downhill ski race, surprisingly, little advantage is gained by getting a running start. (This is because the initial kinetic energy is small compared with the gain in gravitational potential energy even on small hills.) To demonstrate this, find the final speed in m/s and the time taken in seconds for a skier who skies 69.0 m along a 25° slope neglecting friction for the following two cases. (Enter the final speeds to at least one decimal place.)(a)starting from rest find:final speed: in m/stime taken:(b)starting with an initial speed of 3.10 m/sfinal speed: in m/stime taken: in s(c)Does the answer surprise you? Discuss why it is still advantageous to get a running start in very competitive events.

-A 69.0 kg ice hockey goalie, originally at rest, catches a
Question -A 69.0 kg ice hockey goalie, originally at rest, catches a 0.150 kg hockey puck slapped at him at a velocity of 23.0 m/s. Suppose the goalie and the ice puck have an elastic collision and the puck is reflected back in the direction from which it came. What would their final velocities (in m/s) be in this case? (Assume the original direction of the ice puck toward the goalie is in the positive direction. Indicate the direction with the sign of your answer.)puck: (in m/s)goalie: (in m/s)

Suppose a yo-yo has a center shaft that has a 0.270 cm radius and that its string is being pulled.
Question Suppose a yo-yo has a center shaft that has a 0.270 cm radius and that its string is being pulled. a.If the string is stationary and the yo-yo accelerates away from it at a rate of 2.10 m/s2, what is the angular acceleration of the yo-yo in rad/s2? b.What is the angular velocity in rad/s after 0.750 s if it starts from rest?c.The outside radius of the yo-yo is 3.80 cm. What is the tangential acceleration in m/s2 of a point on its edge?

11.A system does 2.70 ✕ 108 J of work while 7.40 ✕ 108 J of heat transfer
Physics Assignment Writing ServiceQuestion 11.A system does 2.70 ✕ 108 J of work while 7.40 ✕ 108 J of heat transfer occurs to the environment. What is the change in internal energy (in J) of the system assuming no other changes (such as in temperature or by the addition of fuel)? (Include the sign of the value in your answer.) 13.The left ventricle of a resting adult’s heart pumps blood at a flow rate of 80.0 cm3/s, increasing its pressure by 110 mm Hg, its velocity from zero to 35.0 cm/s, and its height by 5.00 cm. (All numbers are averaged over the entire heartbeat.) Calculate the total power output (in W) of the left ventricle. Note that most of the power is used to increase blood pressure.

11.Gauge pressure in the fluid surrounding an infant’s brain may rise
Question 11.Gauge pressure in the fluid surrounding an infant’s brain may rise as high as 70.5 mm Hg (5 to 12 mm Hg is normal), creating an outward force large enough to make the skull grow abnormally large.a.Calculate this outward force in newtons on each side of an infant’s skull if the effective area of each side is 98.4 cm2.b.What is the net force (in N) acting on the skull?

4. A very long straight thin wire carries a current of 10 A. Imagine
Question 4. A very long straight thin wire carries a current of 10 A. Imagine an electron at a location 2.0 cm from the wire and moving with a speed of 5,000 km/s. Calculate and show the direction of the magnetic force the electron experiences, for the following situations: a) The electron is moving at that instant parallel with the current, b) The electron is moving at that instant towards the wire, c) The electron is moving at that instant perpendicular to the plane made by the wire and the electron. Make a clear sketch showing the current, the magnetic field and the force for each situation.

2. A charged particle with initial velocity of 1000 km/s enters a
Question 2. A charged particle with initial velocity of 1000 km/s enters a region of uniform magnetic field of strength 2.0 Tesla. What electric field (magnitude and direction) is needed in that region such that the particle moves through undeflected? Explain the reasoning leading to your answer and make a sketch clearly showing the velocity, magnetic field, and electric field vectors.

16.Ultrasound of intensity 1.30 ✕ 10−2 W/m2 is produced by the rectangular
Question 16.Ultrasound of intensity 1.30 ✕ 10−2 W/m2 is produced by the rectangular head of a medical imaging device measuring 3.00 cm by 5.00 cm. What is its power output (in W)?17.Air temperature in a desert can reach 53.0°C (about 127°F). What is the speed of sound (in m/s) in air at that temperature?

19.A car’s bumper is designed to withstand a 4.32 km/h (1.2-m/s) collision
Question 19.A car’s bumper is designed to withstand a 4.32 km/h (1.2-m/s) collision with an immovable object without damage to the body of the car. The bumper cushions the shock by absorbing the force over a distance. Calculate the magnitude of the average force on a bumper that collapses 0.285 m while bringing a 930 kg car to rest from an initial speed of 1.2 m/s.

20.(a).Calculate the force (in N) needed to bring a 850 kg car
Question 20.(a).Calculate the force (in N) needed to bring a 850 kg car to rest from a speed of 85.0 km/h in a distance of 130 m (a fairly typical distance for a non-panic stop).(b).Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 2.00 m. Calculate the force exerted on the car and compare it with the force found in part A (above) . force in (b)/force in (a)=

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