Disregarding friction, a roller coaster with a vertical drop of 46 m will achieve a speed of about 30 m/s. If the height of the drop is doubled, how much the speed is going to be?

Q: A planet has a radius of R = 7.5 x106 m. In that planet, if someone is standing on top of a ladder…

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Q: A cart which has a mass of 20 kilograms slides down a frictionless slope of a hill. If the cart…

A: Given data:  Mass (m) = 20 kg Initial velocity (Vi) = 0 m/s Final velocity (Vf) = 15 m/s…

Q: A pendulum bob has a speed 3 m/s while passing through its lowest position. What is its speed when…

A: Concept: The Schematic Diagram of the system is given below: Here, L=Length L=0.5 m θ= Angle θ=60…

Q: A roller coaster is moving at 11 m/s at the top of the first hill (h= 78 m). Ignoring friction and…

A: here we will be using conservation of energy which states that energy can neither be created nor be…

Q: A 14 kg penguin slides on its belly down an icy, frictionless glacier. If the penguin started from…

A: Write the given values of the problem- Mass=14 kg final speed(vf) vf=14 m/s

Q: Suppose a 3.50 g block is dropped from a height of 7.50 m. What is the speed of the block when it…

A: Given  Mass m=3.50 gram Height h=7.5 m Intitial speed u=0

Q: A stone, M = 1 kg is projected from a point, h= 15 m above the ground with an initial speed, v, = 10…

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Q: Calculate the speed of a 2.1 x 10^3-kg car at the bottom of a driveway if it starts from rest at the…

A: The mass of the car is M=2.1×103 kg The length of the driveway is D=5.0 m The angle of inclination…

Q: A cyclist drives off a 30 m high cliff. If her initial speed is entirely horizontal, how fast will…

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Q: A boy weighing 455 N swings on a 2-m long swing. If his horizontal speed at the lowest point  is 3…

A: SOlution: Given that W = 455 N L =2 m v = 3 m/s

Q: Two planets of mass 1 x 1025kg are release from rest 8.0 x 1012 m apart.  What is the speed of the…

A: Given: Mass of planets : m1=m2=m=1×1025 kg Distance r=8.0×1012m To find the speed ''v'' at half the…

Q: A roller coaster is moving at 10 m/s at the top of the first hill (h= 63 m). Ignoring friction and…

A: Concept  Apply work energy theorem, Change is Potential Energy=Gain in Kinetic energy

Q: You drop a 1.50 kg book to a friend who stands on the ground at distance D= 12.0 m below. Your…

A: Given: D=12.0 m d = 1.80m m = 1.5kg

Q: This and the next two questions apply to this situation: A massive space freighter wants to…

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Q: Say I lift a box from the ground straight up to 1m in 2s. If I lift the same box from the ground but…

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Q: A pendulum consists of a 382.3 gram mass on the end of a 3.9 meter long string that swings back and…

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Q: To make a pendulum, a 410 g ball is attached to one end of a string that has a length of 1.8 m and…

A: Given that -- m = .41 kg length of string  L = 1.8 m initial angle between the string and vertical =…

Q: A ball is thrown straight up in the air with an initial speed of 10 m/s. Ignore air resistance and…

A: Initial speed = vi = 10 m/s Displacement = ( xf - xi ) = 5 m Acceleration due to gravity = a = g =…

Q: If the skier coasts up the hill, what is his speed (in m/s) when he reaches the top plateau? Assume…

A: Energy can neither be created nor destroyed. It is simply converted from one form to another and the…

Q: A 12.0 kg mass is dropped from a hot air balloon at a height of 345 m above the ground. Find it's…

A: Given : Mass dropped from the hot air balloon, m     =   12.0 kg Height at which the mass is…

Q: At what speed does the crate reach the bottom of the inclined plane?

A: Analyze the following diagram. The plane’s height can be represented as, Substitute the relevant…

Q: In a roller coaster the ride includes a vertical drop of 120 m. Suppose that the coaster  has a…

A: Given, Height of fall,h=120 m Speed at top,u=4 m/s

Q: You drop a 1.40 kg book to a friend who stands on the ground at distance D = 13.0 m below. Your…

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Q: The top of a ski hill sits at an altitude of 2000 m. If you were to "Frenchfry" (go straight down…

A: Here, we have to Use Conservation of energy As difference in altitude is given, we just have to…

Q: A train weighing 120 tons is pulled up a 2% grade. The train resistance is constant at 12 lb/ton.…

A: Given that:

Q: If the speed of a car is increased by 95%, by what factor will its minimum braking distance be…

A: Consider the initial speed of the car is u.

Q: In the figure, a frictionless roller coaster car of mass m = 810 kg tops the first hill with speed…

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Q: Two planets of mass 2 x 1025kg are release from rest 9.0 x 1012 m apart. What is the speed of the…

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Q: at the top of the first hill (h= 53 m). Ignoring friction and air resistance, how high will the…

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Q: A proton (mass m = 1.67 x 10-27 kg) is being accelerated along a straight line at 6.20 × 1011 m/s²…

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Q: A roller coaster is moving at 6 m/s at the top of the first hill (h= 56 m). Ignoring friction and…

A: Write the given values with suitable variables. u=6 m/sh=56 mh'=24 m

Q: A pebble is released from rest at a certain height and falls freely, reaching a speed of 4 m/s at…

A: Given :             A pebble at rest u = 0                          speed   v = 4 m/s…

Q: A 30.0-kg child starting from rest slides down a water slide with a vertical height of 10.0 m. What…

A: mass of child(m)=30 kg vertical height(h)=10m as child is coming down its potential energy is…

Q: A child and sled with a combined mass of 48.0 kg slide down a frictionless slope. If the sled starts…

A: Given Mass m    = 48 kg Velocity v = 2.50 m/s Find the height of the hill, as following below.

Q: An electron in a television tube is accelerated uniformly from rest to a speed of 8.4×107m/s over a…

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Q: A cookie jar is moving up a 45 ° incline. At a point 53 cm from the bottom of the incline (measured…

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Q: In the sport of skeleton a participant jumps onto a sled (known as a skeleton) and proceeds to slide…

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Q: A 2-meter chain is placed on a table with heigh 1m , in a way that one end of the chain touches the…

A: SOlution: given thatL =2 m l = 1 m

Q: The Flash (m -70 kg) has been timed running around the Earth's circumference (1.274 x 10 m) in only…

A: Mass of flash m = 70 kg Circumference D = 1.274 × 107 m time t = 5 minute = 5 × 60 = 300 seconds

Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.