Kinematics Questions and Answers

N 10 points A 11 800 kg SEPTA bus is moving with a velocity of 17 2 to the East If the brakes apply a force of 24 780 N to slow the bus down how long does it take the bus to come to rest O 12 3 s 8 2 s 4 2 S 10 7 s

2 40 What is wrong with saying acceleration in the y direction is zero O the dotted line path of the car shows that the car does actually change its velocity in the y direction O the y direction and the centripetal direction would be two completely different directions here Othere is nothing wrong Normal force and Weight are always balanced

Who claimed that speed increases in porpotion to the distance of the fall O a Ob O c Od O e Newton All of the above Einstein Galileo Aristotle

An object is projected horizontally at 400 meters per second If the object falls freely to the ground in 2 0 seconds at what height did it begin its fall 4 9 m 9 8 m 1 2 how calculation 3 19 6 m 4 200 m

1 Two cars drive on a straight highway At time t 0 car 1 passes mile marker 0 traveling due east with a speed of 20 0 m s At the same time car 2 is 0 10 km east of mile marker 0 traveling at 30 0 m s due west Car 1 is speeding up with an acceleration of magnitude 2 5 m s and car 2 is slowing down with an acceleration of magnitude 3 2 m s a Write x versus t equations of motion for both cars taking east as the positive direction b At what time do the cars pass next to one another

8 A chicken is running in a ci to complete one revolution

Presentation Session Stalent dk com student tchayjang Young For Classlick Edpunte Infinite Campus Dylan Young Type Zoom Link Parent Graphs Ms Donolue Science BASO Virtual Acade C Clever Portal Genal YouTube Maps No picture no points 2 10 pts Sally is rowing a boat at 5 6 m s due East across a 112 m wide river The current is flowing due South at 4 m s A Find the resulting velocity vector magnitude and direction B How long does it take her to cross the river C How far downstream is the boat when it reaches the other side

A plane has an airspeed of 123 km h It is flying on a bearing of 76 while there is a 21 km h wind out of the northeast bearing 225 What are the ground speed and the bearing of the plane The ground speed is km h Round to the nearest tenth as needed P

A particle moves from xo 30 cm to x 70 cm in 5 0 s The average velocity of the particle during this time interval is 3 5cm s 2 cm s 20 cm s 16 cm s 8 0 cm s

represents the parabolic trajectory of a ball going from a to e in Earth gravity but without air resistance The initial velocity of the ball is V at an angle 0 to the horizon The vertical dashed lines represent equal time interval At y m Vo Reference Ref 3 3 The horizontal velocity at point c is 0 Vo cos 0 Vo sin 0 Vo x m depends 27

1 Add the following vectors A 56m at 75 B 45m at 115 a Calculate the component of each vector b Calculate the magnitude of the resultant vector c Calculate the direction of the resultant vector 2 A ball is thrown out horizontally out of the second floor window of a house It lands 15 0m from the edge of the building 2 15 s later a How high was the window above the ground b What was the initial velocity of the ball

boat heads in the direction N 74 E The speed of the boat relative to the water is 24 mi h The water is flowing directly south It is observed that the true direction of the boat is directly e Assume that the i vector points east and the j vector points north a Express the velocity of the boat relative to the water as a vector in component form Round your answer to one decimal place b Find the speed of the water and the true speed of the boat Round your answers to one decimal place mi h water boat mi h

Make sure to snow all work in complete detail NO CREDIT shown 1 Consider the following graph for the motion of a particle 8 pts X m 10F 2 0 0 0 0 5 1 0 1 5

A projectile is launched from a height of 20 m with a speed of 40 m s at an angle of 600 above the horizontal Use conservation of energy to find a the maximum height reached by the projectile during its flight and 81 m b the speed with which the projectile hits the ground 45 m s

3 What is the wavelength of light falling on double slits separated by 2 00 um if the third order maximum is at an angle of 55 0 degrees

n object moves in simple harmonic motion with amplitude 10 cm and period 0 25 seconds At time t 0 seconds its displacement d from rest is 0 cm and nitially it moves in a positive direction live the equation modeling the displacement d as a function of time t d 0 9 010

Two sleds are being pulled across frictionless ice rink by two motors The mass of sled 2 is twice as large a the mass of sled 1 The sleds start at rest and each is pulled with the same constant force of magnitude F for the same distance d Neither are true Both are true M O Only I is true O Only II is true 2M F d d motor 1 Consider the following two statements 1 After the sleds have each traveled the same distance d they have the same kinetic energy II After the sleds have each traveled the same distance d they have the same speed Which statements are true Hint Consider the work done O motor 2

3 A ball is thrown upwards with an to reach a height of 30 feet Round c Write a quadratic function t

In the video I drop a ball off a three story balcony We know that objects in freefall follow the equation for height h in meters h 4 9t2 c where t is time in seconds and c is the initial height A student timed the drop at 1 44 seconds Use this to determine the height from which the ball was dropped to at least 2 decimal places meters Question Help Message instructor

1 Explain how both really massive objects and really small objects can both have the same momentum 2 Two objects are about to collide with each other in a head on collision Assuming that they do not start with the same momentum how would you determine once they collide which way they will travel 3 When objects collide with one another why does the change in momentum have to be the same for both

1 Read each question carefully Show all your work for each part of the question The parts within the question may not have equal weight 2 00 m 30 0 A 250 0g snowball of radius 4 00 cm starts from rest at the top of the peak of a roof and rolls down a section angled at 30 0 degrees to the horizontal It then reaches a flat section of roof that is 2 00m lower than the peak and is partially covered in snow as shown above a On the dot below which represents the snowball draw and label the forces not components that act on the snowball Each force must be represented by a distinct arrow starting on and pointing away from the dot The force must start at the point on which it is exerted on the snowball The dashed line represents the roof Please respond on separate paper following directions from your teacher

A bush baby an African primate is capable of a remarkable vertical leap The bush baby goes into a crouch and extends its legs pushing upward for a distance of 0 14 m After this upward acceleration the bush baby leaves the ground and travels upward for 2 3 m Figure 1 Figure 1 of 1 Part A What is the acceleration during the pushing off phase in m s Express your answer in meters per second squared VAZO a Submit Part B Request Answer What is the acceleration during the pushing off phase in g s Express your answer in terms of g VAZO II

A plane has an airspeed of 127 km h It is flying on a bearing of 78 while there is a 21 km h wind out of the northeast bearing 225 What are the ground speed and the bearing of the plane The ground speed is Bound to the nearont tonth km h

325 6 ft 1 Speed and Distance are shown in the diagrams Determine the amount of time it will take for my friend Ben and I to get to the taco truck Use paper and or a calculator as necessary 5 feet per second 2 feet per second Ben s Time 41 4 1 Check My Work My Time

6 A ball of mass 0 25kg is thrown vertically upwards from the roof of the building 18 m high with a speed of 16 m s and just misses the building on the way down a To what vertical height above the Earth does the ball rise 31 m b With what velocity does the ball hit the ground 25 m s 2022 04 19 Pag

v t t cos et for t 0 At time t 1 the object is Moving downward with negative acceleration Moving upward with negative acceleration Moving upward with positive acceleration Moving downward with positive acceleration MacBook Air

The age of a rock sample at one location is 8 64 million years old and the age of a rock sample at the other location is 6 25 million years old One location is 87 4 km farther from the mid ocean ridge than the other What is the speed at which the plate is moving between the two locations

10 What is the momentum of a 12 kg ball that is traveling at 8 m s

9 A swimmer who can swim 4 0 m s in a pool is swimming in a river with a current of 1 5 m s The swimmer is heading in a direction of 30 from upstream She starts from a dock on one side of the river and 12 min later she arrives at the other side of the river a Draw a vector diagram of this situation b Calculate the velocity of the swimmer relative to the banks of the river c How far does the swimmer swim d How w

with a muzzle T A shell is fired from a gun velocity of 40 m s at an angle of 60 with the horizontal At the top of the trajectory the shell explodes into two fragments of equal mass see the figure One fragment whose speed immediately after the explosion is zero falls vertically How far from the gun does the othe fragment land assurning that the terrain level and that the air drag is negligi is No Z 60 0

Koo 60 gun with a muzzle A shell is fired from a velocity of 40 m s the horizontal T at an angle of 60 with At the top of the trajectory the shell explades into two fragments of equal mass see the figure One fragment whose speed immediately after the explosion is zero falls vertically How far from the land does the other gun that the terrain fragment assuming is level and that the air drag is negligib

A wood block is sliding down a rough inclined surface at constant speed. What energy transformation is taking place? Kinetic energy into gravitational potential energy. Gravitational potential energy into thermal energy. Kinetic energy into thermal energy. Gravitational potential energy into kinetic energy.

An apple of mass m rests on a flat table. The earth pulls on this apple with a force of magnitude mg, and the table exerts a normal force on the apple. What is the reaction force to the normal force from the table? The apple pulling upward on the Earth with force mg. The apple pushing down on the table with force mg. The table pushing up on the apple with force mg. The table pushing down on the floor with force mg. The table pulling upward on the Earth with force mg.

Carrie shoots a basketball at an angle of 40° from the horizontal. It leaves her hands 6 feet from the ground with a velocity of 22 ft/s. Step 3 of 3: Determine the height of the ball when it is 10 feet away horizontally. Round to the nearest tenth.

A football was thrown into the air at a speed of 23 miles per hour at an angle of 50° from the horizontal. Express this velocity in vector form. Round your answer to four decimals.

A volleyball was hit into the air at a speed of 21 miles per hour at an angle of 40° from the horizontal. Express this velocity in vector form. Round your answer to four decimals.

A canoe traveling at 60.0 km/h [N] with respect to the water ends up travelling 30.0 km/h [N 45° E] with respect to the shore, due to the current. Use your knowledge of vector components to calculate the current's velocity.

A 0.40 kg football is thrown from a height of 1.6 m with an initial velocity of 150 m/s [R35°U]. How far will the ball travel horizontally when it lands on the ground? [C=4]

The acceleration of a particle at any time t≥ 0 is given by ā=dv/dx=16cos2tî - 4sin3tĵ+ 6tk If the velocity and displacement rare zero at t = 0, find and at any time.

A boat is traveling at 34 knots in a direction of 68°. It encounters wind moving at 11 knots in a direction of 15°. What is the true velocity and direction of the boat? Round to the nearest whole number.

Arvin the Ant is on a picnic table. He travels 30.0 cm northeast, then 25.0 cm due north, and finally 15.0 cm west.. What is the direction of Arvin's net displacement? (northeast means 45 degrees north of east). 82 degrees North of East 65 degrees South of west 65 degrees North of east 82 degrees South of west

The hole on a level, elevated golf green is a horizontal distance of 155 m from the tee and at an elevation of 12.9 m. above the tee. A golfer hits a ball at an angle of 9.4° above the horizontal and makes a hole-in-one! What was the initial speed of the ball?

Suppose a projectile is launched vertically from a height of 33 feet and projectile reaches a maximum height of 1633 feet. Determine the initial velocity of the projectile.

Suppose a hiker, standing near the edge of a 416 meter tall cliff, throws a rock downward vertically off the cliff at a speed of 68 meters per second. Determine the velocity and acceleration of the rock at the moment the rock impacts the ground. Round solutions to the nearest thousandth, if necessary. The rocks's velocity at the point of impact is The rocks's acceleration at the point of impact is

Suppose an arrow is shot vertically upward, from a height of 4 feet above the ground, at a velocity of 209 feet per second. Determine the velocity and acceleration of the arrow at the moment the arrow impacts the ground. Round solutions to the nearest thousandth, if necessary. The arrow's speed at the point of impact is _____ The arrow's acceleration at the point of impact is ________

A ball of mass 0.075 kg is fired horizontally into a ballistic pendulum as shown in the figure above. The pendulum alone has a mass of 0.350 kg. The ball is caught in the pendulum, and the center of mass of the system rises a vertical distance of 0.145 m. (a) What is the initial speed of the ball? (b) What is the speed of the pendulum immediately after it catches the ball? (c) Find the kinetic energy loss due to the collision. Assume that g = 9.80! m/s². Show your work.

The record distance in the sport of throwing cowpats is 81.1 m. This record toss was set by Steve Urner of the United States in 1981. Assuming the initial launch angle was 45° and neglecting air resistance, answer the following. (a) Determine the initial speed of the projectile. m/s (b) Determine the total time the projectile was in flight. S (c) Qualitatively, how would the answers change if the launch angle were greater than 45º? Explain.

An important piece of landing equipment must be thrown to a ship, which is moving at a constant 5 m/sec towards the dock. The equipment is thrown to the ship with an initial speed vo = 15 m/sec, at an angle of 0 = 60° above the horizontal, and from a height of 8.75 m above the dock. What must d, the initial horizontal distance between the dock and the ship be, so that the equipment can land on the ship? Answer: 40.0 m.

A boat is crossing a river, and is pointed directly West. The engines from the boat are pushing theboat West with a force of 315 N. The river is flowing South, and pushes the boat with a force of 125 N. If the boat has a mass of 180 kg, what is the boat's acceleration? a.Draw a free body diagram and use vector addition to show the net force during this acceleration. show forces as if Biewing boat from above (Fmoter + Friver) b. Calculate the acceleration.

For an object that is located 20 m from its original position, a negative slope on a distance-time graph indicates: a) the object is not moving b) the object is moving away from the origin c) the object is changing direction d) the object is moving towards the origin