Monday
January 16, 2017

# Homework Help: Science: Physics

## Recent Homework Questions About Physics

physics
A student is skateboarding down a ramp that is 5.79 m long and inclined at 17.6Â° with respect to the horizontal. The initial speed of the skateboarder at the top of the ramp is 4.22 m/s. Neglect friction and find the speed at the bottom of the ramp.
Monday, October 5, 2015 by Anonymous

physics
A 57.5-kg runner has a speed of 5.80 m/s at one instant during a long-distance event. (a) What is the runner's kinetic energy at this instant? 967.15 J (b) If he doubles his speed to reach the finish line, by what factor does his kinetic energy change? im having trouble ...
Monday, October 5, 2015 by zach

Physics
Two 1kg blocks rest on opposite sides of the double inclined plane. One inclined planes makes an angle of 30 degrees and the other an angle of 60 degrees with horizontal. The masses are connected by a light cord passing over a friction less pulley. What is the largest value of...
Monday, October 5, 2015 by Nicholle

Physics
As an aid in working this problem, consult Interactive Solution 3.62. A ferryboat is traveling in a direction 32.0 Â° north of east with a speed of 5.38 m/s relative to the water. A passenger is walking with a velocity of 1.50 m/s due east relative to the boat. What ...
Monday, October 5, 2015 by Hannah

Physics
In a marathon race Chad is out in front, running due north at a speed of 3.98 m/s. John is 95 m behind him, running due north at a speed of 4.52 m/s. How long does it take for John to pass Chad?
Monday, October 5, 2015 by Hannah

Physics
a missile is launched off a jet fighter travelling 300 meters per second. it accelerated with a constant acceleration of 100 meters per second. when it has traveled 5000 meters what will its velocity be?
Monday, October 5, 2015 by Rachael

Physics
An airplane with a speed of 82.2 m/s is climbing upward at an angle of 71.6 Â° with respect to the horizontal. When the plane's altitude is 772 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath ...
Monday, October 5, 2015 by Hannah

physics
A volleyball is spiked so that it has an initial velocity of 19.9 m/s directed downward at an angle of 55.8 Â° below the horizontal. What is the horizontal component of the ball's velocity when the opposing player fields the ball?
Monday, October 5, 2015 by Hannah

Physics
A race car moving at 35 m/s is uniformly slowed to a stop in 50 s. Find 1) acceleration, and 2) stopping distance.
Monday, October 5, 2015 by Emily

Physics
Q: A car travels in a straight line for 4.6 h at a constant speed of 95 km/h . What is its acceleration? Answer in units of m/s 2
Monday, October 5, 2015 by anonymous

Physics
You are standing on the roof of a building 300 m high, and throw a stone upward at 25 m/s. Find the speed of the stone as it strikes the ground.
Monday, October 5, 2015 by Josh

Physics
A girl hits a ball at an angle of arc tan3/8 to the horizontal from a point O which is O.5m above level ground.The initial speed of the ball is 15m/s at the height of 18m from the girl,find the time taken for the ball to reach the fence and the height of the fence.
Monday, October 5, 2015 by Enimatique Alogorithm MM

physics
A kayaker paddles at 4.0 m/s in a direction 30Â° south of west. He then turns and paddles at 3.7 m/s in a direction 20Â° west of south. I know the formulas but having trouble figuring out the degree of angle. Ax=4(cos30)= 3.4641 Ay=4(sin30)= 2 Bx=3.7(cos20...
Monday, October 5, 2015 by Lou

physics
1) A T-shirt cannon at a basketball game launches shirts to the upper level at 55 m/s with an angle of 52 degrees. Find the height (dy) of the seats if it takes 4.5 seconds to land in the seats. 2) A soccer ball is kicked on a flat field by the goalie at an initial velocity of...
Monday, October 5, 2015 by Keke

Physics
Two loudspeakers are mounted on a merry-go-round whose radius is 9.68 m. When stationary, the speakers both play a tone whose frequency is 132 Hz. As the drawing illustrates, they are situated at opposite ends of a diameter. The speed of sound is 343.00 m/s, and the merry-go-...
Monday, October 5, 2015 by Anonymous

Physics
Two sources of sound are located on the x axis, and each emits power uniformly in all directions. There are no reflections. One source is positioned at the origin and the other at x = +153 m. The source at the origin emits four times as much power as the other source. Where on...
Monday, October 5, 2015 by Anonymous

Physics
A boy walks 10 m due west and 10m due south.What is the displacement.[2]a girl walks 12m northwards,5m eastwards and 7m southwards.Calculate her total displacement[3]a man walks 5km south and 3km in the direction 60 degree west of south.Calculate his distance from starting point.
Monday, October 5, 2015 by Moyosoreoluwa

Physics
Two blocks connected by a rope of negligible mass are being dragged by a horizontal force F (Fig. P5.45). Suppose that F = 75.0 N, m1 = 14.0 kg, m2 = 19.0 kg, and the coefficient of kinetic friction between each block and the surface is 0.098. a)Determine the tension T. b)...
Monday, October 5, 2015 by Ali

Physics
A 15.0-g metal cylinder is placed on a turntable, with its center 73 cm from the turntable's center. The coefficient of static friction between the cylinder and the turntable's surface is μs = 0.79. A thin, massless string of length 73 cm connects the center of ...
Monday, October 5, 2015 by Erin

physics
In lacrosse, a ball is thrown from a net on the end of stick by rotating the stick and forearm about the elbow. If the angular velocity of the ball about the elbow joint is 30.3 rad / s and the ball is 1.35 m from the elbow joint, what is the velocity of the ball?
Monday, October 5, 2015 by jordan

Physics
The following circuits represent a logarithm amplifier The output voltage for a log amp with a diode can be determined by the formula below Vout = -(.025V)ln(Vin/IR*R1) , the ln is the natural logarithm of a number. Calculate in a table and sketch the output voltage versus the...
Monday, October 5, 2015 by Megameno

physics
Two capacitors of capacities c1=3uf and c2=6uf arranged in series are connected in a parallel with third capacitor c3=4uf. The arrangement is connected to a 6.0 V battery. Calculate the total energy stored in the capacitors.
Monday, October 5, 2015 by shahbaz ahmad pala

Physics
Differentiate between an integrator and differentiator
Monday, October 5, 2015 by NONEE

Physics
Let your car have a mass of 825 kg. Your car is moving at a speed of 3.08 m/s when it strikes a parked car and stops in 0.21 s. What force did the parked car exert on it to stop it that quickly?
Monday, October 5, 2015 by Michael

Physics
An astronaut on a distant planet wants to determine its acceleration due to gravity. The astronaut throws a rock straight up with a velocity of +16 m/s and measures a time of 23.2 s before the rock returns to his hand. What is the acceleration (magnitude and direction) due to ...
Monday, October 5, 2015 by Ramen Noods

PHYSICS
A 1420-kg submarine rises straight up towards the surface. Seawater exerts both an upward buoyant force of 16930 N on the submarine, as well as a downward resistive force of 1030 N. What is the submarine's acceleration?
Monday, October 5, 2015 by Anonymous

Physics
A plane head north with an airspeed of 420 km/h. However, relative to the ground, it travels in a direction 7.0 west of north. if the wind's direction is towards the southwest (45.0 south of west), what is the wind speed?
Sunday, October 4, 2015 by JHM

PHYSICS
Three forces act on a moving object. One force has a magnitude of 81.2 N and is directed due north. Another has a magnitude of 47.9 N and is directed due west. What must be (a) the magnitude and (b) the direction of the third force, such that the object continues to move with ...
Sunday, October 4, 2015 by Anonymous

PHYSICS
A 103-kg baseball player slides into second base. The coefficient of kinetic friction between the player and the ground is μk = 0.555. (a) What is the magnitude of the frictional force? (b) If the player comes to rest after 1.05 s, what is his initial speed?
Sunday, October 4, 2015 by Anonymous

PHYSICS
A car is traveling up a hill that is inclined at an angle θ above the horizontal. Determine the ratio of the magnitude of the normal force to the weight of the car when (a) θ = 15o and (b) θ = 32o.
Sunday, October 4, 2015 by Anonymous

PHYSICS
A 50.5-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.624 and 0.364, respectively. What horizontal pushing force is required to (a) just start the crate moving and (b) slide the crate across the dock at a constant speed?
Sunday, October 4, 2015 by Anonymous

physics
a rocket launched off a cliff is represented by the equation h(t)= -16t^2+100t+140. when will this rocket reach 200 feet? I tried to factor it, i'm confused.
Sunday, October 4, 2015 by angel

physics
A rock is dropped from a tree of height 22 m into a lake (depth 4.0 m) below. After entering the water, the rock floats gently down through the water at a constant speed of 1.4 m/s to the bottom of the lake. What is the total elapsed time?
Sunday, October 4, 2015 by julia

Physics
A small plane aims to fly directly east at 120. km/h, but a headwind is blowing 50. km/h at 22 degrees south of west, slowing the plane down. Find the plane's actual ground speed and direction.
Sunday, October 4, 2015 by brooklyn

Physics
If you kick a football at 64.7 m/s at 49 degrees? a) How long is the ball in the air? b) Where does the ball land horizontally? c) What is the balls vertical acceleration at the top of its flight?
Sunday, October 4, 2015 by Ghazi

Physics
A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.890 m/s at an angle of 36.0Â° above the table, and it lands on the magazine 0.0660 s after leaving the table. Ignore air resistance. How thick is the ...
Sunday, October 4, 2015 by Hannah

PHYSICS
Two skaters, a man and a woman, are standing on ice. Neglect any friction between the skate blades and the ice. The mass of the man is 88 kg, and the mass of the woman is 58 kg. The woman pushes on the man with a force of 56 N due east. Determine the acceleration (magnitude ...
Sunday, October 4, 2015 by Anonymous

Physics
A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 660 m/s. The gun is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.027 m below the center. What is the horizontal distance between the end of the rifle...
Sunday, October 4, 2015 by Hannah

Physics
A quarterback throws a pass at an angle of 40 degrees above the horizontal with an initial speed of 20 m/s. The ball is caught by the receiver 2.55 seconds later. Determine horizontal velocity, vertical initial velocity, the distance ball was thrown, and maximum height of the ...
Sunday, October 4, 2015 by Jose Luis

PHYSICS
The space probe Deep Space 1 was launched on October 24, 1998. Its mass was 474 kg. The goal of the mission was to test a new kind of engine called an ion propulsion drive. This engine generated only a weak thrust, but it could do so over long periods of time with the ...
Sunday, October 4, 2015 by Anonymous

Physics
A sports car skids to a stop, leaving skid marks 290 m long. If the coefficient of kinetic friction between tires and pavement is 0.80, how fast was the car going before the skid?
Sunday, October 4, 2015 by Luis

Physics
A person 1.90 m tall walks on a horizontal icy surface. The coefficient of friction between the surface of the ice and the person's shoe sole is μ = 0.33 and the length of the person's legs are 1/2 of the person's height. Determine the maximum step length the ...
Sunday, October 4, 2015 by Jacob

physics
A curved road is banked at an angle such that friction is not necessary for a car to stay on the road. a 2500 kg car is traveling at a speed of 25 ms and the road has a radius of curvature equal to 40 m. calculate the magnitude of force that the road exerts on the car? I think...
Sunday, October 4, 2015 by amelia

physics
I need help understanding these, please. Thanks! 1. A 2 kg body moves with constant velocity when a force of 10 N is applied. What is the coefficient of kinetic friction between the table and the body? (Would I use F=m*g for this??) 2. Which of the following statements is ...
Sunday, October 4, 2015 by Ellie

Physics
An 80 kg man stands in an elevator. What force does the floor of the elevator exert on the man if a) the elevator is stationary? b) the elevator accelerates upward at 2 m/s2? c) the elevator rises with constant velocity 4 m/s? d) while rising, the elevator decelerates at 1.5 m...
Sunday, October 4, 2015 by John Scott

Physics
A boy throws a ball straight up into the air so that it leaves his hand at 11 m/s. If the ball has mass 0.15 kg and the boy's arm moved through 1.5 m as he threw the ball, then what average force did he exert on the ball? I'm completely confused. I looked over my notes...
Sunday, October 4, 2015 by John Scott

Physics
A stone is thrown up and returns to it's starting point 6 second later. Find the stone's initial speed.
Sunday, October 4, 2015 by Mike

Physics
A plane can travel with a speed of 80 mi/hr with respect to the air. Determine the resultant velocity of the plane (magnitude only) if it encounters a: 10 mi/hr cross wind; 60 mi/hr cross wind; 10 mi/hr tailwind; 10 mi/hr headwind. I have no idea what equation to use to solve ...
Sunday, October 4, 2015 by Oleg

physics
A 3000-kg truck needs a propeling steady force of 1400 N to travel at a speed of 40 mpg. What is the MPG for the truck if its engine efficiency is 27%? Heat released from one gallon=136,500,000 J and 1 m= 1609 m.
Sunday, October 4, 2015 by Penny

Physics
A quarterback throws a pass at an angle of 40 degrees above the horizontal with an initial speed of 20 m/s. The ball is caught by the receiver 2.55 seconds later. Determine horizontal velocity, vertical initial velocity, the distance ball was thrown, and maximum height of the ...
Sunday, October 4, 2015 by JoseF3

Physics
A mass hangs on the end of a massless rope. The pendulum is held horizontal and released from rest. When the mass reaches the bottom of its path it is moving at a speed v = 2.4 m/s and the tension in the rope is T = 15.5 N. A peg is placed 4/5 of the way down the pendulum&...
Sunday, October 4, 2015 by Hannah

physics
An athlete executing a long jump leaves the ground at a 28.9 ∘ angle and travels 7.70 m .What was the takeoff speed?If this speed were increased by just 4.0%, how much longer would the jump be?
Sunday, October 4, 2015 by alex

Physics
John has used a solar simulator setup to measure the relation between the voltage and the current of a small photovoltaic module (40 cm long and 40 cm wide). The measurement setup maintains the standard measurement conditions: the temperature is controlled to 25oC, the ...
Sunday, October 4, 2015 by Prasad

Physics
At time t1 = 2.00 s, the acceleration of a particle in counterclockwise circular motion is (5.00 m/s2)i hat + (6.00 m/s2)j. It moves at constant speed. At time t2 = 5.00 s, its acceleration is (6.00 m/s2)i hat + (−5.00 m/s2)j. What is the radius of the path taken by the ...
Sunday, October 4, 2015 by Rach

physics sl
A dead dog of mass 2.2 kg and an initial speed of 5.5 m.s-1 slides along a rough horizontal surface and stops after travelling 4.2 m. calculate the frictional force between the dog and the surface (Think of the work the friction has to do to stop the dog â€“ ...
Sunday, October 4, 2015 by samuel

Physics
A galvanometer needle deflects full scale for 53.0A current. What current will give full-scale deflection if the magnetic field weakens to 0.860 of its original value?
Sunday, October 4, 2015 by gaopalelwe

Physics
Figure Ex5.7 shows the velocity graph of a 5.0 kg box as it pushed to the right (->) along a horizontal surface. Assume that a 12 newton friction force acts on the box to the left (<-) during its the entire motion. What is the amount of right-ward (->) acting push on ...
Saturday, October 3, 2015 by ames

physics
A w1 = 255 N bucket is lifted with an acceleration of a = 2.00 m/s2 by a w2 = 105 N uniform vertical chain. A.Find the tension in the top link of the chain. B.Find the tension in the middle link of the chain. C.Find the tension in the bottom link of the chain.
Saturday, October 3, 2015 by Anonymous

physics
The driver of a truck slams on the brakes when he sees a tree blocking the road. The truck slows down uniformly with acceleration −5.80 m/s2 for 4.20 s, making skid marks 57.2 m long that end at the tree. With what speed does the truck then strike the tree? Vi=Vf-at Vi=...
Saturday, October 3, 2015 by kdberg

Physics
You testify as an expert witness in a case involving an accident in which car A slid into the rear of car B, which was stopped at a red light along a road headed down a hill (Fig. 1). You find that the slope of the hill is Ɵ = 120 , that the cars were separated by ...
Saturday, October 3, 2015 by Jo

Physics
A person 1.90 m tall walks on a horizontal icy surface. The coefficient of friction between the surface of the ice and the person's shoe sole is μ = 0.33 and the length of the person's legs are 1/2 of the person's height. Determine the maximum step length the ...
Saturday, October 3, 2015 by Jacob

physics
When landing after a spectacular somersault, a 40.0 kg gymnast decelerates by pushing straight down on the mat. Calculate the force she must exert if her deceleration is 5.00 times the acceleration of gravity.
Saturday, October 3, 2015 by andrew

Physics
A large centrifuge is used to expose aspiring astronauts to accelerations similar to those experienced in rocket launches and atmospheric reentries. a) At what angular velocity is the centripetal acceleration 10 gs if the rider is 10.0 m from the center of rotation? (b) The ...
Saturday, October 3, 2015 by Anonymous

Physics
A 360 g model rocket is on a cart that is rolling to the right at a speed of 2.5 m/s. The rocket engine, when it is fired, exerts an 8.5 N thrust on the rocket. Your goal is to have the rocket pass through a small horizontal hoop that is 20 m above the launch point. At what ...
Saturday, October 3, 2015 by Anonymous

PHYSICS
forces of 3N and 4N and 12N act at a point in mutually perpendicular directions. Tha magnitude of the resultant force in newton is
Saturday, October 3, 2015 by Sreethi

Physics
1) A box m1 = 9.30 kg is stacked on top of another box m2 = 20.0 kg, placed on the floor inside an elevator. When the elevator is accelerating downward with a magnitude of 3.72 m/s2, what is the normal force that box m1 exerts on box m2? What is the normal force that the ...
Saturday, October 3, 2015 by Mike

physics
A metal ball is thrown vertically upwards from the top of a tower with an initial velocity of 20 metres per seconds. If the ball took a total of 6 seconds to reach ground level, determine the height of the tower.
Saturday, October 3, 2015 by anonymous

Physics
The electric field at a distance of 0.150 m from the surface of a solid insulating sphere with radius 0.367 m is 1720 N/C . Assuming the sphere's charge is uniformly distributed, what is the charge density inside it? Calculate the electric field inside the sphere at a ...
Saturday, October 3, 2015 by jj

Physics
It is friction that provides the force for a car to accelerate, so for high performance cars the factor that limits acceleration isn't the engine; it's the tires. For typical rubber-on-concrete friction, what is the shortest time in which a car coukd accelerate from 0 ...
Saturday, October 3, 2015 by Lane

Physics
Plz, i need the workings. An object is acted upon by two forces of 5N and 12N. Calculate the resultant of two forces if the forces acting perpendicular to each other
Saturday, October 3, 2015 by Benjamin

Physics
A car is traveling at a speed of 15 m/s, slams on the brakes, locking the wheel of the car. The coefficient of kinetic friction between the tires and the road is 0.64. What is the speed of the vehicle after 2 seconds have passed?
Friday, October 2, 2015 by Jose F3

Physics
A conducting solid sphere (R = 0.24 m, q = 7.6x10^-6 C) is shown in the figure. Using Gauss's Law and two different Gaussian surfaces, determine the electric field (magnitude and direction) at point A, which is 0.000001 m outside the conducting sphere. (Hint: One Gaussian ...
Friday, October 2, 2015 by Geneva

Physics
In a repair shop a truck engine that has mass 429 kg is held in place by four light cables (Figure 1) . Cable A is horizontal, cables B and D are vertical, and cable C makes an angle of 37.1∘ with a vertical wall. Tension in cable A is 729 N . a.What is the tension in ...
Friday, October 2, 2015 by David

physics
A care package is released from a plane moving with a horizontal speed of 123 m/s. The plane flies at a constant height of 1013 m above the ground. a.) Find the speed of the care package just before it hits the ground. b.) Find the magnitude of the angle with respect to the x-...
Friday, October 2, 2015 by Janice

E& M physics
Three electrons form an equilateral triangle 0.600 nm on each side. A proton is at the center of the triangle. What is the potential energy of this group of charges?
Friday, October 2, 2015 by Master Blaster

Physics
A block M1 of mass 20.0 kg sits on top of a larger block M2 of mass 30.0 kg which sits on a flat surface. The kinetic friction coefficient between the upper and lower block is 0.415. The kinetic friction coefficient between the lower block and the flat surface is 0.115. A ...
Friday, October 2, 2015 by Marty

physics
Suppose the horizontal sweep of an oscilloscope takes 80ms how many cycles of a 100 Hz wave will be shown?
Friday, October 2, 2015 by stephanie

Physics. Interesting group question
Does Newton's laws apply on earth even though we are constantly accelerating? I thought it would be true because it would apply to the uniform circular motion wouldn't it?
Friday, October 2, 2015 by Alessandra

physics
a mango fruit drops to the ground from the top of its tree which is 5m high.how long does it take to reach the ground?
Friday, October 2, 2015 by adeoye

Physics
When you pull out a stuck drawer, the force of static friction causes it to stick in place. This causes the drawer to jerk outwards, sometimes violently. Assume that you apply a constant force just large enough to â€œunstickâ€&​#157; the drawer...
Friday, October 2, 2015 by Anon2013

physics
you throw a ball from a cliff with an initial velocity of 15m/s at an angle of 20Â° below the horizontal.find(a) its horizontal displacement and(b) its vertical displacement 2.3sec later?
Friday, October 2, 2015 by maaz

physics
The elastic potential energy E is given by E=C p^2 g^2 A l0^3,where p is the density of the metal.g is the acceleration of free fall. A is the cross-sectional area of the wire and C is a constant. determine the si base units of C? Am Confused...help.
Friday, October 2, 2015 by chancy

Physics - Inverted pendulum
Hello. My son is in pre-school, but he's already starting his Undergraduate for college. Never too early to start, right? So he got this problem for homework. Can anyone help? He supposedly needed "nap time" and slept through the entire lecture the professor was ...
Friday, October 2, 2015 by John Cena

Physics acceleration
A car accelerates uniformly from rest to a speed of 91.4 mi/h in 7.68 s. Find the constant acceleration of the car. Answer in units of m/s
Thursday, October 1, 2015 by Jackie

AP Physics
Question Part Points Submissions Used The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters ...
Thursday, October 1, 2015 by Anonymous

physics
Only two forces act on an object (mass=4.41 kg), as in the drawing. Find (a) the magnitude and (b) the direction (relative to the x axis) of the acceleration of the object.
Thursday, October 1, 2015 by jordan

physics
Two forces A and B are applied to an object whose mass is 12.3 kg. The larger force is A . When both forces point due east, the object's acceleration has a magnitude of 0.443 m/s2. However, when A points due east and B points due west, the acceleration is 0.280 m/s2, due ...
Thursday, October 1, 2015 by jordan

Physics help!!
A 0.15 kg baseball is moving at 49 m/s toward home plate when it is hit with the bat. The ball is in contact with the bat for 0.0022 s, and leaves the bat at 25 m/s directly away from home plate. Determine the average force exerted by the bat on the ball.
Thursday, October 1, 2015 by jerod

Physics
There are competitions in which pilots fly small planes low over the ground and drop weights, trying to hit a target A pilot flying low and slow drops a weight; it takes 1.6 s to hit the ground, during which it travels a horizontal distance of 160 m . Now the pilot does a run ...
Thursday, October 1, 2015 by raquel

physics
On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball with a golf club improvised from a tool. The free-fall acceleration on the moon is 1/6 of its value on earth. Suppose he hit the ball with a speed of 25 m/s at an angle 24 ∘ above the horizontal...
Thursday, October 1, 2015 by raquel

physics
An astronaut on a strange planet nds that she can jump a maximum horizontal distance of 30 m if her initial speed is 9 m/s. What is the acceleration of gravity on the planet? θ=45Â° because maximum distance R=(ViÂ²/g)(sin2θ) g=2.7m/sÂ²...
Thursday, October 1, 2015 by ari

Physics
A rifle is aimed horizontally at a target 50 m away. The bullet hits the target 2.4 cm below the aim point What was the bullet's speed as it left the barrel? Express your answer to two significant figures and include the appropriate units
Thursday, October 1, 2015 by raquel

physics
A net horizontal force F =A +Bt^3 acts on a 2kg object, where A = 5N and B = 2N/s3. What is the horizontal velocity of this object 4.0 seconds after it starts from rest? F=ma=5+2t^3 a=2.5+t^3 V=2.5t+(1/4)(t^3) therefore, at t=4, V=74m/s Is this correct?
Thursday, October 1, 2015 by ari

Physics
A hockey player is standing on his skates on a frozen pond when an opposing player, moving with a uniform speed of 14 m/s, skates by with the puck. After 3.5 s, the first player makes up his mind to chase his opponent. (a) If he accelerates uniformly at 4.0 m/s2, how long does...
Thursday, October 1, 2015 by Michael

Physics
A ball is tossed straight up into the air with a velocity of 37 m/s. What is its velocity at the top of its flight?
Thursday, October 1, 2015 by Isabelle

Physics
A road heading due east passes over a small hill. You drive a car of mass m at constant speed v over the top of the hill, where the shape of the roadway is well approximated as an arc of a circle with radius R. Sensors have been placed on the road surface there to measure the ...
Thursday, October 1, 2015 by David

physics
A 5 kg magnet exerts a constant force of 3 N on a 0.25 kg magnet. What force will the smaller magnet exert on the larger magnet?
Thursday, October 1, 2015 by Anonymous

Physics
Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 6.41 m. The stones are thrown with the same speed of 8.35 m/s. Find the location (above the base of the ...
Thursday, October 1, 2015 by bob

physics
A skier leaves the top of a ski ramp at an angle of 25 degrees with an initial velocity of 10 m/s. The ramp is 60 m high, neglecting air resistance determine: a. The time it takes the sk ier to reach the ground. b. How far away from the base does he land? c. How high above the...
Thursday, October 1, 2015 by T

physics
A ball is kicked with an initial velocity of 20.0 m/s at an angle of 35 degrees to the ground. If it is to pass over a wall 5.6 m high determine a. The minimum horizontal the wall can be placed from the ballâ€™s launch point in meters. b. What would be the ball...
Thursday, October 1, 2015 by T