Monday

August 3, 2015

August 3, 2015

**Physics**

A 75kg firefighter slides down a 2.5m fire pole from rest. It takes the firefighter 1.8s to reach the ground. If the firefighter bends his knees when he reaches the ground such that his centre of mass mives 41cm while coming to a stop, what must the normal force of the ground ...
*Wednesday, March 11, 2015 by Anonymous*

**Ap physics**

Rotational Motion/Torque The question says that "A 60.0kg painter is on a uniform 25 kg scaffold supported from above by ropes. There is a 5.0 kg pail of paint to one side, as shown. How far from the left end of the scaffold should the painter stand such that the right ...
*Wednesday, March 11, 2015 by Kayla*

**Physics**

A pilot wants to fly directly north to an airport 500 km away. His speed relative to the air is 100 km/h. Howevere there is a 40 km/h cross wind blowing from west to east. At what angle relative to the south north direction should he fly to arrive at the distant airport? How ...
*Wednesday, March 11, 2015 by Alex*

**Physics**

A 75kg firefighter slides down a 2.5m fire pole from rest. It takes the firefighter 1.8s to reach the ground. If the firefighter bends his knees when he reaches the ground such that his centre of mass mives 41cm while coming to a stop, what must the normal force of the ground ...
*Wednesday, March 11, 2015 by Anonymous*

**Physics**

A 75kg firefighter slides down a 2.5m fire pole from rest. It takes the firefighter 1.8s to reach the ground. If the firefighter bends his knees when he reaches the ground such that his centre of mass mives 41cm while coming to a stop, what must the normal force of the ground ...
*Wednesday, March 11, 2015 by Anonymous*

**Physics**

A 100 lb block of ice slides down an incline 5.0 ft long and 3.0 ft high. A worker pushes up on the ice parallel to the incline so that it slides down at constant speed. The coefficient of friction between the ice and the incline is 0.10. Find (a) the force exerted by the ...
*Wednesday, March 11, 2015 by Emily*

**physics**

The angular position of a flywheel is given by theta=(2+5t+2t^2)rad . find the angular speed and acceleration at 3^rd second after the motion had been started.
*Wednesday, March 11, 2015 by help*

**physics**

2) Two objects are initially the same height above the ground. Simultaneously, one is released from rest and the other is shot horizontally with an initial speed of 2.5 m/s. The two objects collide after falling 20.0 m. How far apart were the objects initially?
*Wednesday, March 11, 2015 by Anonymous*

**physics**

2)Two objects are initially the same height above the ground. Simultaneously, one is released from rest and the other is shot horizontally with an initial speed of 2.5 m/s. The two objects collide after falling 20.0 m. How far apart were the objects initially?
*Wednesday, March 11, 2015 by Anonymous*

**physics**

two blocks of each mass m=3.75kg are fastened to the ceiling of an elevator. If the elevator accelerates upward at 1.6m/s^2. Find the tension in T1 and T2 in each upper and lower rope
*Wednesday, March 11, 2015 by Rebecca*

**Physics**

A mover pushes a 60 lb box 30 ft along a level floor at constant speed with a force directed 45 degrees below the horizontal. If the coefficient of kinetic friction is 0.20, how much work does the mover do on the box? ...Is this one of those trick questions where the work is 0?
*Wednesday, March 11, 2015 by Emma*

**physics**

a force of 10N acts on an object and raises its speed from 0 to 5 m/s in 10s.calcuate the average power.
*Wednesday, March 11, 2015 by doc*

**Physics**

A 100 lb block of ice slides down an incline 5.0 ft long and 3.0 ft high. A worker pushes up on the ice parallel to the incline so that it slides down at constant speed. The coefficient of friction between the ice and incline is 0.10. Find the force exerted by the worker. (I&#...
*Wednesday, March 11, 2015 by N*

**Physics**

You count 9 cycles across 8.1 time divisions on an oscilloscope screen. The time sweep is set to 60 micro seconds. The voltage peak is measured to be 22 volts. What is the frequency? You plot some data of Real Frequency versus HP Dial Frequency and get a linear trend of y = 1....
*Wednesday, March 11, 2015 by Isa*

**Physics **

1. Given t1/2 to be 0.0137 seconds, how long should it take to reach 87.5% of maximum charge?
*Tuesday, March 10, 2015 by B*

**Physics**

The coefficient of static friction between the m = 3.75-kg crate and the 35.0° incline of the figure below is 0.320. What minimum force vector F must be applied to the crate perpendicular to the incline to prevent the crate from sliding down the incline?
*Tuesday, March 10, 2015 by Ryan*

**Physics help please!**

1. Given t1/2 to be 0.0137 seconds, how long should it take to reach 87.5% of maximum charge? 2. Let's say you measure t1/2 to be 0.0137 seconds and the resistance in the circuit is 99 Ohms. Then what is the capacitance in micro Farads? 3.q = qmax(1 - e -t / τ) Using ...
*Tuesday, March 10, 2015 by B*

**physics**

*please walk me through equation The patellar tendon attaches to the tibia at the tibial tuberosity. The tibial tuberosity is 7 cm from the center of the knee joint. The patellar tendon pulls at an angle of 35deg to the line passing through the tibial tuberosity and the center...
*Tuesday, March 10, 2015 by eagle1*

**Physics**

Zak, helping his mother rearrange the furniture in their living room, moves a 58.3 kg sofa 7.7 m with a constant force of 25 N. What is the work done by Zak on the sofa? Neglect friction. Answer in units of J. What is the average acceleration of the sofa? Answer in units of m/...
*Tuesday, March 10, 2015 by monica :)*

**Physics**

We want to find how much charge is on the electrons in a nickel coin. Follow this method. A nickel coin has a mass of about 5.7 g. a. Find the number of atoms in a nickel coin. Each mole (6.02 × 10^23 atoms) has a mass of about 57.9 g. Answer in units of atoms. b. Find ...
*Tuesday, March 10, 2015 by Jess*

**Physics**

A charge q1 = 5 µC is at the origin, and a charge q2 = 4 µC is on the x axis at x = 6 m. Find the force on charge q2 . The Colulomb constant is 8.98755 × 10^9 N·m^2/C^2. Answer in units of N.
*Tuesday, March 10, 2015 by Jess*

**Physics**

A strong lightning bolt transfers about 21.45 C to Earth. How many electrons are transferred? The elemental charge is 1.602 × 10^−19 C.
*Tuesday, March 10, 2015 by Jess*

**physics**

A plastic rod is rubbed against a wool shirt, thereby acquiring a charge of −4.9 µC. How many electrons are transferred from the wool shirt to the plastic rod? The elemental charge is 1.6 × 10−19 C.
*Tuesday, March 10, 2015 by Bob*

**physics**

You can estimate your distance from a lightning storm by watching for a lightning flash and then counting in one-second intervals using the general rule that you are 1 km away for every 3 s you count. Explain why this rule works. Estimate the distance from a lightning storm if...
*Tuesday, March 10, 2015 by gal*

**Physics**

If a mass of gasoline occupies 70.01 at 20°C, What is the volume at 35°C?
*Tuesday, March 10, 2015 by Kram *

**Physics**

An object floats in a liquid of density 1.2×10 kg/m3 with one quarter of its volume above the liquid surface. You are required to determine the density of the object
*Tuesday, March 10, 2015 by Kram *

**physics **

A system of 1216 particles, each of which is either an electron or a proton, has a net charge of -5.920×10-17 C. A)How many electrons are in this system (exactly)? B)What is the mass of this system (to three significant digits)?
*Tuesday, March 10, 2015 by Samantha*

**Physics**

Billy stands on a hill without slipping. In which direction is the force of friction acting?
*Tuesday, March 10, 2015 by Hanna*

**Physics College**

A heat engine operates in a Carnot cycle between 78.0°C and 340°C. It absorbs 22,000 J of energy per cycle from the hot reservoir. The duration of each cycle is 3.00 s. (a) What is the mechanical power output of this engine? (answer in kW) (b) How much energy does it ...
*Tuesday, March 10, 2015 by Meena*

**physics**

calculate the linear speed of a point on the record at the beginning and the end of the record that rotates at 33rev/min r1=7cm,r2=15cm
*Tuesday, March 10, 2015 by selena*

**physics**

A car's wheel of radius r=50cm goes through 5000rev in 1min. find the car's average angular velocity,and how far it travels along the ground in 1min. The linear speed v and angular speed w of the point of a rotating body are connected by the equation v=wr. where r is ...
*Tuesday, March 10, 2015 by Sarah*

**Physics**

Hi guys, I was just wondering if I'm heading in the right direction with this question. Thank you so much in advance for your time!! A loudspeaker emits energy at the rate of 56W , spread in all directions. What is the intensity of sound 18m from the speaker? Working out (...
*Tuesday, March 10, 2015 by Kylie*

**physics**

What design aspects of the snowmobile make it particulary useful for travel over ice and snow?
*Tuesday, March 10, 2015 by chris*

**Physics**

Hello to all the fantastic tutors! I'm stuck on this question, I was wondering if there is a way to solve this. A car horn emits 378Hz sound. If the car moves at 23m/s with its horn blasting, what frequency will a person standing in front of the car hear? What I've ...
*Tuesday, March 10, 2015 by Tommy*

**physics**

a car set out at noon to ride from point a to point b, and another car started at 2 pm on the same day to ride from point b to point a. they met on the road at 4:05 pm, and each car reached their destination at exactly the same time. at what time did the car arrive?(hint: both...
*Tuesday, March 10, 2015 by steven*

**physics**

4. A ball is thrown so that it just clears a 3m fence 18m away. If it left the hand 1.5m above the ground and at an angle of 60° with the horizontal, what was the initial velocity of the ball?
*Tuesday, March 10, 2015 by steven*

**physics**

a ball dropped from rest at a height of 50 m above the ground. (a) what is the speed just before it hits the ground? (b) how long does it take to reach the ground?
*Tuesday, March 10, 2015 by sha*

**physics**

a car moving at 30 m/s slows to a speed of 10 m/s in a time of 5 s. determine a.) the acceleration of the car (b). the distance it moves in the third second.
*Tuesday, March 10, 2015 by sha*

**physics**

You can estimate your distance from a lightning storm by watching for a lightning flash and then counting in one-second intervals using the general rule that you are 1 km away for every 3 s you count. Explain why this rule works. Estimate the distance from a lightning storm if...
*Monday, March 9, 2015 by gal*

**physics **

a 6 0 kg piece of aluminum at 645 degrees to celsius is combine with 1.0 kg of ice at -15 degrees Celsius in a thermally isolated calorimeter of negligible heat capacity what is the equalilbrum temperature the mixture evenually reaches?. q1+q2+q3=0 QAl = .6kg* .9kj/kg-K * ...
*Monday, March 9, 2015 by sharon*

**Physics**

How close to the edge of the 24.0 kg table shown in Figure 9-47 can a 60.0 kg person sit without tipping it over? m Table is 2.2m long each leg is 5m into the table and there is 1.2m in between each leg. The table is 8m in height.
*Monday, March 9, 2015 by gabby*

**physics**

The speedometer on an automobile measures the rotational speed of the axle and converts that to a linear speed of the car, assuming the car has 0.62-m-diameter tires. What is the rotational speed of the axle when the car is traveling at 26m/s ?
*Monday, March 9, 2015 by Please Help*

**physics**

A ballet student with her arms and a leg extended spins with an initial rotational speed of 0.90rev/s . As she draws her arms and leg in toward her body, her rotational inertia becomes 0.80 kg⋅m2 and her rotational velocity is 4.1rev/s . Determine her initial rotational ...
*Monday, March 9, 2015 by Please Help*

**physics**

Determine the change in rotational kinetic energy when the rotational velocity of the turntable of a stereo system increases from 0 to 33 rpm. Its rotational inertia is 6.8×10−3kg⋅m2 .
*Monday, March 9, 2015 by Please Help*

**Physics**

A container with a one-liter capacity at 27 degree C is filled with helium to a pressure of 2 atm. how many moles of helium does it hold?
*Monday, March 9, 2015 by eddy*

**physics**

You need to lift a 200 kg box 5 meters, but it is too heavy. You decide to push it up an incline that makes a 25 degree angle with the ground. With what force do you need to push the box?
*Monday, March 9, 2015 by gal*

**physics**

Show that the kinetic energy of two particles with mass m1 and m2 split into the energy of the centre of mass and the kinetic energy of relative motion.
*Monday, March 9, 2015 by don*

**physics**

A car covers half a distance at a velocity of 80km/h and the other half at 60km/h,what is the average velocity of the car?
*Monday, March 9, 2015 by don*

**physics**

The drive propeller of a ship starts from rest and accelerates at 2.90×10-3 rad/s2 for 2.10×103 s. For the next 1.40×103 s the propeller rotates at a constant angular speed. Then it decelerates at 2.30×10-3 rad/s2 until it slows (without reversing ...
*Monday, March 9, 2015 by Jennifer*

**physics**

The sun has a mass of 1.99 × 1030 kg and is moving in a circular orbit about the center of our galaxy, the Milky Way. The radius of the orbit is 2.3 × 104 light-years (1 light-year = 9.5 × 1015 m), and the angular speed of the sun is 1.1 × 10-15 rad/s. ...
*Monday, March 9, 2015 by Jennifer*

**physics**

A motorcycle, which has an initial linear speed of 6.6 m/s, decelerates to a speed of 2.1 m/s in 5.0 s. Each wheel has a radius of 0.65 m and is rotating in a counterclockwise (positive) direction. What are a) the constant angular acceleration (in rad/s^2) and b) the angular ...
*Monday, March 9, 2015 by Jennifer*

**physics**

a person is pulling a 100 lb box across a smooth horizontal surface. what is the acceleration of the box if they are pulling upward at an angle of 20° with a force of 75 lbs Well, I know that there is no friction involved because it is a smooth surface and that n+TsinΘ...
*Monday, March 9, 2015 by Hanky*

**physics**

A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.875 m/s encounters a rough horizontal surface of length ℓ = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.357 and he exerts a constant ...
*Monday, March 9, 2015 by Ange*

**physics**

a 0.5KG ball is drop at concrete incline which is 45 degree above the horizontal then bounces off with the speed of 5m/s due to the force applied on it what is the change in its momentum?
*Monday, March 9, 2015 by musonda*

**physics**

a 0.5KG ball is drop at concrete incline which is 45 degree above the horizontal then bounces off with the speed of 5m/s due to the force applied on it what is the change in its momentum
*Monday, March 9, 2015 by musonda*

**Physics 1014**

A large bowl contains water 10cm deep and has a small electric lamp at the bottom.A disc of cardboard is floating on the surface with its centre vertically above the lamp,and is of such diameter that the lamp can just not be seen by a person looking into the water.calculate ...
*Monday, March 9, 2015 by Ntakadzeni*

**physics**

A bullet is fired with an initial velocity 300m s at an angle 30 degree with horizontal . At what distance from the gun will the bullet strike the ground ?
*Monday, March 9, 2015 by rajeev*

**Physics**

A 54.8 g ball of copper has a net charge of 2.5 µC. What fraction of the copper's electrons have been removed? (Each copper atom has 29 protons, and copper has an atomic mass of 63.5.)
*Monday, March 9, 2015 by Carlos Montoya*

**physics for physical science **

A stone thrown vertically upwards with a speed of 12m/s from the edge of Cliff 70m high. Calculate the time the stone takes to hit the bottom of the cliff.
*Monday, March 9, 2015 by Justin *

**physics **

an object is placed 15 cm in front of a convex lens of focal length 10cm. Find the nature and position of the image formed. where should a concave mirror of radius of curvature 20cm be placed so that the final image is formed at the position of the object itself.
*Monday, March 9, 2015 by meenakshi*

**physics**

How many kilometers would you have to go above the surface of the earth for your weight to decrease to 39{\rm \\%} of what it was at the surface? Express your answer using two significant figures.
*Monday, March 9, 2015 by danny*

**physics**

A highway curve with radius 1000ft is to be banked so that a car traveling 56.0mph will not skid sideways even in the absence of friction At what angle should the curve be banked?
*Monday, March 9, 2015 by danny*

**physics **

A block (mass m) hangs from a spring (spring constant k). The block is released from rest a distance d above its equilibrium position. (a) What is the speed of the block as it passes through the equilibrium point? (Use any variable or symbol stated above along with the ...
*Sunday, March 8, 2015 by Eva*

**physics**

A war-wolf, or trebuchet, is a device used during the Middle Ages to throw rocks at castles and now sometimes used to fling pumpkins and pianos. A simple trebuchet is shown in the figure below. Model it as a stiff rod of negligible mass 3.00 m long and joining particles of ...
*Sunday, March 8, 2015 by amar *

**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?
*Sunday, March 8, 2015 by Anonymous*

**ap physics**

A student sits on a rotating stool holding two 3.8-kg objects. When his arms are extended horizontally, the objects are 1.0 m from the axis of rotation and he rotates with an angular speed of 0.75 rad/s. The moment of inertia of the student plus stool is 3.0 kg · m2 and...
*Sunday, March 8, 2015 by yesica*

**ap physics**

(a) Calculate the angular momentum of Earth that arises from its spinning motion on its axis, treating Earth as a uniform solid sphere. J · s (b) Calculate the angular momentum of Earth that arises from its orbital motion about the Sun, treating Earth as a point ...
*Sunday, March 8, 2015 by yesica*

**physics**

Each of the following objects has a radius of 0.169 m and a mass of 2.02 kg, and each rotates about an axis through its center (as in this table) with an angular speed of 38.6 rad/s. Find the magnitude of the angular momentum of each object. (a) a hoop kg · m2/s (b) a ...
*Sunday, March 8, 2015 by alba*

**Physics - Mini Lab**

The reason I didn't do this was because I was gone the day they did this at school. And the teacher said I couldn't do it at school. So I need help and my teacher is a jerk, so I have no idea what to do. Please help me. I really need a good grade in this class. Please...
*Sunday, March 8, 2015 by Marisa*

**Physics**

Continue walking at a constant speed. Just after you release the ball upward, make a sharp right turn. Where does the ball land?
*Sunday, March 8, 2015 by Marisa*

**Physics**

Continue walking at a constant speed. Just after you release the ball upward, break into a run. Where does the ball land?
*Sunday, March 8, 2015 by Marisa*

**Physics**

Continue walking at a constant speed. This time, stop instantly just after you release the ball upward. Where does the ball land?
*Sunday, March 8, 2015 by Marisa*

**Physics**

Newton's first law of motion states that an object in motion will continue to move at constant speed in a straight line. Only an outside force can change the speed or direction. If the object is at rest, it will remain at rest, unless an outside force is exerted on it. ...
*Sunday, March 8, 2015 by Marisa*

**physics**

A physics student pulls a block of mass m = 20 kg up an incline at a slow constant velocity for a distance of d = 4.5 m. The incline makes an angle Δ = 30° with the horizontal. The coefficient of kinetic friction between the block and the inclined plane is µk = ...
*Sunday, March 8, 2015 by sunny*

**Physics**

Charges of 4 µC are located at x = 0, y = 2.0 m and at x = 0, y = -2.0 m. Charges Q are located at x = 4.0 m, y = 2.0 m and at x = 4.0 m, y = -2.0 m. The electric field at x = 0, y = 0 is (4 ✕ 103 N/C) i. Determine Q.
*Sunday, March 8, 2015 by srdja*

**Physics**

A football player kicks with a speed of 21 m/s at 37 degree to the horizontal. How long is the ball in the air?
*Sunday, March 8, 2015 by Cullen*

**physics**

if a monochromatic beam of light with a wavelength of 590 nanometers is traveling through air then enters a region of space where the index of refraction is 1.5, what will the light beam do? increase, decrease, or stay the same?
*Sunday, March 8, 2015 by sue*

**Physics**

A 24.5-kg child is standing on the outer edge of a merry-go-round which has moment of inertia 989 kg • m2 and radius 2.40 m. The entire system is initially rotating at 0.180 rev/s. Find the angular velocity if the child moves to a final position 1.10 m from the center of ...
*Sunday, March 8, 2015 by Anonymous*

**physics**

calculate how far along the ground would the bicycle move if one of the wheels had an angular displacement magnitude of 500rev
*Sunday, March 8, 2015 by Sarah*

**physics**

If a bicycle moves 20m what is the angular displacement in degrees, revolution and radians?
*Sunday, March 8, 2015 by solomon*

**mathematics,physics,life science,LO,afrikaans**

A number of circles are given and the area of the smallest circles is 4π.The area of the next circle is 9/4 times of the previous circle.if there are 6 circles,determine the length of the diameter of the last circle.
*Sunday, March 8, 2015 by uchriciah*

**projectile motion physics**

There is a minimum angle above the ground such that if the ball is launched below this angle, it can never clear the bar, no matter how fast it is kicked. What is this angle?
*Sunday, March 8, 2015 by Kevin*

**Physics**

An exceptional standing jump would raise a person 0.90 m off the ground. To do this, what force must a person of mass 66 kg exert against the ground? Assume the person crouches a distance of 0.20 m prior to jumping, and thus the upward force has this distance to act before he ...
*Sunday, March 8, 2015 by Jrom*

**Physics**

A helicopter carrying Dr. Evil takes off with a constant upward acceleration of 5.0 m/s2. Secret agent Austin Powers jumps on just as the helicopter lifts off the ground. After the two men struggle for 10.0 s, Powers shuts off the engine and steps out of the helicopter. Assume...
*Sunday, March 8, 2015 by Ko*

**projectile motion physics**

Imagine the ball on the left is given a nonzero initial speed in the horizontal direction, while the ball on the right continues to fall with zero initial velocity. What horizontal speed vx must the ball on the left start with so that it hits the ground at the same position as...
*Sunday, March 8, 2015 by Kevin*

**physics**

A 310-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 25° with the horizontal. What is the angular speed of the sphere at the bottom of the slope if it starts from rest? rad/s
*Sunday, March 8, 2015 by alba*

**physics**

A solid, uniform disk of radius 0.250 m and mass 60.4 kg rolls down a ramp of length 4.60 m that makes an angle of 18.0° with the horizontal. The disk starts from rest from the top of the ramp. (a) Find the speed of the disk's center of mass when it reaches the bottom ...
*Sunday, March 8, 2015 by mathew*

**physics**

A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. A constant tangential force of 280 N applied to its edge causes the wheel to have an angular acceleration of 0.960 rad/s2. (a) What is the moment of ...
*Sunday, March 8, 2015 by alba*

**physics**

What is the force on the charge located at x = +8.00 cm in Figure 17.40(a) given that q = 5.00 n C and a = 7.00? (The positive direction is to the right.) N
*Sunday, March 8, 2015 by mathew*

**ap physics**

A beam resting on two pivots has a length of L = 6.00 m and mass M = 87.0 kg. The pivot under the left end exerts a normal force n1 on the beam, and the second pivot placed a distance ℓ = 4.00 m from the left end exerts a normal force n2. A woman of mass m = 54.0 kg ...
*Sunday, March 8, 2015 by amar *

**physics**

how much force is required to stop a 100 mi/hr fastball? Assume the catcher's mitt stops the ball in 1 millisecond and the mass of a baseball is 145 g.
*Saturday, March 7, 2015 by george*

**Physics**

Your parents have just bought you a new Canon digital camera. You wish to show your friends a picture of it, but you have no other cameras in the house. So you decide to stand 1.5 m in front of a flat mirror. For what distance should you focus your camera lens?
*Saturday, March 7, 2015 by Anonymous*

**Physics**

A 0.2 kg ball moves to the right with a speed of 3 m/s. It hits a 0.5 kg ball that at rest. After collision, the second ball moves to the right with a speed of 1 m/s. What is the speed of the first ball after collision?
*Saturday, March 7, 2015 by Please help*

**Physics**

A 0.02 kg ball moving to the right at 0.25 m/s makes an elastic head-on collision with a 0.04 kg ball moving to the left at 0.15 m/s. After the collision, the smaller ball moves to the left at 0.16 m/s. What is the velocity of the 0.04 kg ball after collision?
*Saturday, March 7, 2015 by Please help*

**Physics**

Carl hits a 0.05 kg golf ball giving it a speed of 65 m/s. What impulse does he impact to the ball?
*Saturday, March 7, 2015 by Please help*

**Physics**

A football is kicked at an angle of 40 degrees with an initial speed of 7 m/s. What is the horizontal distance traveled by the ball?
*Saturday, March 7, 2015 by Please help*

**Physics**

A volleyball is served at an angle of 35 degrees with an initial speed of 5 m/s. What is the maximum height reached by the ball?
*Saturday, March 7, 2015 by Please help*

**Physics**

A frisbee is thrown horizontally with a speed of 12 m/s. If the frisbee moves a horizontal distance of 15 m, how long will it stay in the air?
*Saturday, March 7, 2015 by Please help*

**physics**

A black and tackle with a velocity ratio of 5 is used to raise a mass of 25kg through a vertical distance of 40cm at a steady rate.if the effort is equal to 60N, determine a. The distance moved by the effort b. The work done by the effort in lifting the load
*Saturday, March 7, 2015 by abubakar*

**physics**

skater has a mass of 45 kg and is at rest. skater 2 has a mass of 50 kg and is moving along at a constant velocity of 3.2 m/s East. skater 3 has a mass of 75 kg and is moving quickly at a constant velocity of 9.6 m/s East. which state experiences the greatest force?
*Saturday, March 7, 2015 by ella*