Physics questions and answers in February 2021

4) A freight train consists of two 8.3 • 104 kg engines and 45 cars with average masses of 5.8 • 104 kg each . Randomized Variables m = 8.3 • 104 kg m2 = 5.8 • 104 kg f = 7.75?...
a. What happens to a window during a strong hurricane? Does it implode or explode and why? b. A large boulder is thrown into a deep lake. As it sinks deeper, does the buoyant force upon it decreases o...
Topic: Angular Momentum I have no clue how to figure these out. Please help me. What is the angular momentum for a 2kg ball being swung in a circle of radius 3m at a speed of 4 m/s? A 3 kg object is m...
Candace (sister to Phineas) has taken up pole-vaulting for her school track & field team. She approaches the takeoff point at a speed of 9.00 m/s, and we want to know how high she can vault. a. At...
Jumping from a 10 m high platform and hitting the water at a speed of 30 mph is a daunting enough prospect on its own. But when you have to throw in a series of somersaults and twists in between , and...
Phineas is driving a car down the street at a certin speed, he slams on the brakes, causing the car to immediately go into a skid. He comes to a stop 100 ft later. Ferb takes a turn driving the same b...
please help me .. and please make your writing easy to follow... thank you.. 5. A gyroscope wheel weighs 7.0 lb and has an effective radius of 4.0 in. It spins with its axis horizontal at a rate of 3,...
1) A cyclist gets on his bike. He pushes relatively hard on the pedal and begins his trip. Once he begins moving, he doesn't have to push quite so hard to move faster. For a while, he coasts without p...
You are going up in an elevator. Initially the elevator accelerates for 2.0 s to 6.0 m/s. Then it moves for 4.0 s, and then it stops uniformly in 3.0 s. What are the magnitudes of the normal forces ex...
Q1: A ball is thrown horizontally from the top of a 60m building and lands 100m from the base of the building. Ignore air resistance. What was the vertical component of the velocity just before it hit...
Serving at a speed of 170 km/h , a tennis player hits the ball at a height of 2.5 m and an angle θ below the horizontal . The service line is 11.9 m from the net, which is 0.91 m high . Part (a)  ...