# Physics

**physics**

For cars having the same shape but different size engines the maximum power developed by the car’s engine is proportional to the third power of the car’s maximum speed. Predict the dependence on speed of the wind resistance force.

**physics**

A car of mass 1200 kg starts from rest, accelerates uniformly to a speed of 4.0 m/s in 2.0 s and continues moving at this constant speed in a horizontal straight line for an additional 10 s. The brakes are then applied and the car is brought to rest in 4.0 s. A constant ...

**Physics**

A 25.0 kg block is very slowly raised up a vertical distance of 10.0 m by a rope attached to an electric motor in a time of 8.2 s. Calculate the power developed in the motor.

**Physics**

An object is dropped from a height H and reaches the ground with a velocity v. The same object is thrown down from the same height H with an initial velocity v and reaches the ground with a velocity v2. Which of the following is the relationship between v2 and v? The answer is...

**Physics! NEED HELP!**

A 40 kg girl runs up a flight of stairs that is 34 m high. How much work does this require?

**Physics!**

A 40 kg girl runs up a flight of stairs that is 34 m high. How much work does this require?

**Physics**

A(n) 94 kg clock initially at rest on a horizontal floor requires a(n) 697 N horizontal force to set it in motion. After the clock is in motion, a horizontal force of 530 N keeps it moving with a constant velocity. The acceleration of gravity is 9.81 m/s2 Find µk between the ...

**Physics**

A block with a weight of 3.7 N is launched along a slope upwards by a spring with k = 2.25 kN / m. The slope makes an angle of 30° with the horizontal and has a vertical height of 0.75 m (measured from the starting point of the block). When the block is released, the spring ...

**Maths, Physics, Resultant force**

Hi all, I have been given component x- and y- for F1=(8.0*10^7N,7.0*10^7N) F2=(4.0*10^7N,-2.0*10^7N) for an object. Which following my textbooks have found the following vector components: F1+F2=(1.2*10^8N,5.0*10^7N) Now I want to find the distance from earth that this object ...

**Physics**

Beth, a construction worker, attempts to pull a stake out of the ground by pulling on a rope that is attached to the stake. The rope makes an angle of 44.8 ◦ with the horizontal. If Beth exerts a force of 146.8 N on the rope, what is the magnitude of the upward component of ...

**Physics - Fluids**

A helium balloon (mass including fill gas 2.1 g) is tied to a long string (mass per unit length is 3.1*10^2 g/cm, i.e., one cm of the string has a mass of 3.1*10-2 g). It rises to a height x of 210 cm, with the remainder of the string laying on the floor. If the density of air...

**physics**

A warehouse worker pushes a crate along the floor, as shown in the figure below, with a force of F = 10.5 N that points at an angle of θ = 61°. Find the horizontal and vertical components of the force.

**physics**

A 50.0 kg mountain climber is rappelling down a steep mountain face. Her foot makes contact with the rock at point A. Her rope attaches to her harness at point B, which is located at x1 = 0.77 m and y1 = 0.42 m relative to point A. Her centre of mass is found at point C, which...

**Physics**

Ann, a 66.2 kg person throws a 0.0461 kg snowball forward with a ground speed of 39.2 m/s. Billy, with a mass of 54.8 kg, catches the snowball. Both people are on skates (Disregard friction between the skates and the ice. ). Ann is initially moving forward with a speed of 2.02...

**Maths, Physics, Resultant force**

Hi all, I have been given component x- and y- for F1=(8.0*10^7N,7.0*10^7N) F2=(4.0*10^7N,-2.0*10^7N) for an object. Which following my textbooks have found the following vector components: F1+F2=(1.2*10^8N,5.0*10^7N) Now I want to find the distance from earth that this object ...

**Physics**

Supposed a skydiver ( mass=75kg ) is falling toward the earth. When the skydiver is 100m above the earth he is moving at 60m/s. At this point calculate the skydiver: Gravitational potential energy Kinetic energy Total mechanical energy

**Physics**

A ball is battled straight up and returns to the level of the batter after 6.5s determine how high the ball went

**Physics**

A bal is batted straight up and returns to the level of the batter after 6.5s. Determine how high the ball went. A=-9.8m/s^2

**Physics**

Calculate the weight of an object whose Mass is 5kg.(take g=10m\s

**Physics**

Calculate the weight of an object whose Mass is 5kg.(take g=10m\s

**physics**

021 (part 1 of 3) 10.0 points A block is at rest on the incline shown in the ﬁgure. The coeﬃcients of static and kinetic friction are µs = 0.62 and µk = 0.53, respectively. The acceleration of gravity is 9.8 m/s2 . 36 kg µ 29◦ What is the frictional force acting on ...

**Physics**

A hummingbird ﬂies 2.7 m along a straight path at a height of 5.3 m above the ground. Upon spotting a ﬂower below, the hummingbird drops directly downward 1.8 m to hover in front of the ﬂower. a) What is the magnitude of the hummingbird’s total displacement? Answer in ...

**Physics**

A hummingbird ﬂies 2.7 m along a straight path at a height of 5.3 m above the ground. Upon spotting a ﬂower below, the hummingbird drops directly downward 1.8 m to hover in front of the ﬂower. a) What is the magnitude of the hummingbird’s total displacement? Answer in...

**Physics**

A - A hummingbird ﬂies 2.7 m along a straight path at a height of 5.3 m above the ground. Upon spotting a ﬂower below, the hummingbird drops directly downward 1.8 m to hover in front of the ﬂower. a) What is the magnitude of the hummingbird’s total displacement? Answer...

**Physics**

A - A hummingbird ﬂies 2.7 m along a straight path at a height of 5.3 m above the ground. Upon spotting a ﬂower below, the hummingbird drops directly downward 1.8 m to hover in front of the ﬂower. a) What is the magnitude of the hummingbird’s total displacement? Answer...

**physics**

If object B is dropped from a height of 100 m while moving horizontally at 115 m/s. How much time will it take for object B to hit the ground? (round answer to the tenth's place and use "s" to describe your answer)

**Physics**

A vector drawn 8.5 cm long represents a force of 22 N. What force does a vector that is 16.8 cm long, drawn to the same scale, represent? Answer in units of N.

**Physics**

A vector drawn 4.7 cm long represents a force of 37 N. How long would you draw a vector for a force of 303.1 N? Answer in units of cm

**Physics**

A - A golfer takes two putts to sink his ball in the hole once he is on the green. The ﬁrst putt displaces the ball 8.10 m east, and the second putt displaces it 1.99 m south. What displacement would put the ball in the hole in one putt? Answer in units of m. -I got the ...

**physics**

When bunting, a baseball player uses the bat to change both the speed and direction of the baseball. (b) The baseball has a mass of 0.11 kg; its speeds before and after the bunt are 16 m/s and 12 m/s, respectively; and the bunt lasts 0.023 s. What is the change in momentum of ...

**Physics**

A loaded tractor-trailer with a total mass of 5000 kg traveling at 3.0 km/h hits a loading dock and comes to a stop in 0.64 s. What is the magnitude of the average force exerted on the truck by the dock?

**Physics**

A 0.20-kg billiard ball travelling at a speed of 15 m/s? strikes the side rail of a pool table at an angle of 60°. If the ball rebounds at the same speed and angle, what is the magnitude of its change in momentum? I need help!

**physics**

An aircraft has a take-off speed 180km/h and has length 250m from the start just before take-off a serious snag is detected in the engine and the aircraft failed to take-off. There is a wall at a distance of 270 m from takeoff point

**Physics**

A tennis ball is projected with a velocity of 3 meter per second at an angle of 39 degree to the horizontal calculate the time of light in second ( take g to be 9.8 meter per second square)

**Physics**

One ship, sailing east with a speed of 7.5 m/s, passes a certain point at 8A.Mand a second ship sailing north at the same speed, passed the same point at 9:30 A.M. At What time are they closest together and what is the distance between them then?

**physics**

an airplane flying north is observed from the ground. it's velocity is 225 m/s north. the pilot who is flying the plane measures a velocity of 250m/s north. what is the velocity of the wind that affects the plane

**More physics help**

A solid cylinder with a radius of 5.08 cm starts from rest at the top of a 12m long ramp inclined 20.3 degrees above the horizontal. When it reaches the bottom of the ramp 3.25s later the cylinder has a final linear velocity of 7.38 m/s. What was the average angular velocity ...

**Physics**

A placekicker kicks a football with a velocity of 35 m/sec and an angle of 25˚ above the horizontal. When the football is 10 m off the ground, a. What is the horizontal velocity of the ball? b. What is the vertical velocity of the ball? c. What is the total velocity of the ...

**Physics Help**

A student is trying to reduce the mass of a racing bike to achieve greater acceleration. Which would be more beneficial to reduce (assuming each has identical mass)? a. decrease mass in the frame b. decrease mass in the wheels c. decrease mass in the rider d. these are all equal

**Physics**

Three point sized bodies each of mass M fixed at three corners of light triangular frame of side length L about an axis perpendicular to the plane of frame and passing through centre of frame the moment of inertia of three bodies is

**Physics**

A golf ball is shot from a tee, elevated 20m above the green, with an initial speed of 27m/s at an angle of 50° above horizontal. a) What will be the speed of the golf ball before it hits the green, 20m below it started? b) How much time will it take for the ball to travel ...

**Physics**

a golf ball is shot from a tee which is located 18.0m above the green. The initial velocity of the golf ball is 42.0 m/s at an angle of 50.0 degrees above the horizontal. The ball behaves as an ideal projectile during its flight from the tee to the green(i.e. no air resistance...

**Physics**

In an 8.00 km race, one runner runs at a steady 12.0 km/h and another runs at 14.6 km/h

**Physics**

Excellent human jumpers can leap straight up to a height of 100 cm off the ground. To reach this height, with what speed would a person need to leave the ground?

**Physics**

In a 5.00 km race, one runner runs at a steady 11.3 km/h and another runs at 14.9 km/h . How long does the faster runner have to wait at the finish line to see the slower runner cross?

**Physics**

A rocket, initially at rest on the ground, accelerates straight upward from rest with constant acceleration 58.8 m/s2 . The acceleration period lasts for time 5.00 s until the fuel is exhausted. After that, the rocket is in free fall. Max height

**Physics**

A rocket, initially at rest on the ground, accelerates straight upward from rest with constant acceleration 58.8 m/s2 . The acceleration period lasts for time 5.00 s until the fuel is exhausted. After that, the rocket is in free fall.

**Physics**

When striking, the pike, a predatory fish, can accelerate from rest to a speed of 3.6 m/s in 0.11 s . Distance?

**Physics**

When striking, the pike, a predatory fish, can accelerate from rest to a speed of 3.6 m/s in 0.11 s .

**physics**

Traveling at a speed of 18.0 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.690. What is the speed of the automobile after 1.29 s have elapsed? Ignore the effects of ...

**Physics**

A person pushes on a 62-kg refrigerator with a horizontal force of -280 N; the minus sign indicates that the force points in the -x direction. The coefficient of static friction is 0.70. (a) If the refrigerator does not move, what are the magnitude and direction of the static ...

**Physics**

A physics major is working to pay his college tuition by performing in a traveling carnival. He rides a motorcycle inside a hollow transparent plastic sphere. After gaining sufficient speed, he travels in a vertical circle with a radius of 11.8 m . The physics major has a mass...

**physics**

Determine the coefficient of friction between a girl's skis and the snow when she skis down a 20° degree hill and her ending speed is exactly two-fifths of what it would have been if the slope had been frictionless.

**Physics**

Determine the coefficient of friction between a girl's skis and the snow when she skis down a 20° degree hill and her ending speed is exactly two-fifths of what it would have been if the slope had been frictionless.

**Physics**

You stand at the bottom of an 8.0-m-long ramp that is inclined at 37∘ above the horizontal. You grab packages off a conveyor belt and propel them up the ramp. The coefficient of kinetic friction between the packages and the ramp is μk=0.30. A) What speed do you need to give...

**physics**

a tennis player receives a shot with the ball travelling horizontally at 50.0 m/s and returns the shot with the ball traveling horizontally at 40.0 m/s in the opposite direction. what is the impulse delivered to the ball from the tennis racquet?

**Physics**

A golfer putts a ball to a point 22.0 ft. east of his position. The ball passed south of the hole. In order to sink the ball into the hole from his new location, the golfer will have to putt the ball 7.0 ft. on a bearing of 302T. How many feet away from the hole was he before ...

**Physics**

A flight attendant pulls her 66 N flight bag a distance of 359 m along a level airport floor at a constant velocity. The force she exerts is 42 N at an angle of 54Â° above the horizontal.

**Physics**

An ideal gas is sealed within a container at a tempreture of 17 degree celcies and a pressure of 101KPa. The container is heated until the tempreture of the gas reaches 100 degree celcies. A valve in the container is then opened to allow gas to escape until the pressure falls ...

**physics**

A 6.25-gram bullet travels at 365 m/s. It hits and enters a 4.50-kg crate. The crates slides 0.15m along a floor until it comes to rest. Find the friction force between the crate and the floor I used p=mv to get momentum and got 2.28125 N•s I calculated speed of the crate/...

**physics**

Two cars are on a collision course. One is going right 18 m/s and has a mass of 860kg. The other is going left at 24 m/s and has a mass of 840 kg. 1. Find the total initial momentum of the two cars For this question I did first car: 860(18) = 15480 second car: 840(-24) = -...

**physics**

15. During the opening kickoff of a college football game, the kicker kicks a football with an initial velocity of 27.5 m/s at an angle of 41° above horizontal. I. What is the time of flight for the ball? II. How far does it travel before hitting the ground? III. What is the ...

**physics**

14.To test the durability of a new shock-proof camera, the company has the camera dropped from a height of 15.0 m. Assume air resistance is negligible. How long does it take for the camera to hit the ground? What is the speed of the camera just before it hits the ground?

**Physics**

A bouncy rubber ball and a squishy mud ball were thrown at a wall. The mud ball stuck, and the rubber ball bounced back off. Which transferred more momentum to the wall (i.e., which experienced the largest change in momentum)? The balls have identical velocities.

**Physics**

A steel wire 2.7-mm in diameter stretches by 0.211 percent when a mass is suspended from it. How large is the mass in kg?

**physics**

"A 25-N crate is held at rest on a frictionless incline by a force that is parallel to the incline. If the incline is 25◦ above the horizontal the magnitude of the normal force of the incline on the crate is: "?

**Physics**

Richard is driving home to visit his parents. 130 mi of the trip are on the interstate highway where the speed limit is 65 mph . Normally Richard drives at the speed limit, but today he is running late and decides to take his chances by driving at 80 mph .

**Physics**

Why are good conductors of heat also good conductors of electricity

**physics**

A locomotive is running at a constant speed of 100 km/ h. The diameter of driving wheels is 1.8 m. The stroke of the piston of the steam engine cylinder of the locomotive is 600 mm. Find the centripetal acceleration of the crank pin relative to the engine frame

**physics**

A locomotive is running at a constant speed of 100 km/ h. The diameter of driving wheels is 1.8 m. The stroke of the piston of the steam engine cylinder of the locomotive is 600 mm. Find the centripetal acceleration of the crank pin relative to the engine frame??

**Programming**

Hi I am new to programming and I need your Help to solve this Problem. Thanks! draw your draft of the corresponding flowchart. On a new paper following your flowchart, write its equivalent using pseudocodes. Questions: 1. You are left in charge of taking care of your baby ...

**Physics**

An airplane is experiencing turbulence and at some point you feel like feeling lighter. If at that moment your apparent weight is 70% of your normal weight, what is the size and direction of the acceleration of the plane?

**physics**

A boxcar of mass 250 tons at rest becomes uncoupled on a 4.0° grade. If the track is considered to be frictionless, what speed does the boxcar have after 11 seconds?

**pure physics 5054 grade12 zambian exam**

why is it that 10g of ice at freezing point cools a drink faster than water of mass 10g at the same temperature(freezing point) [4marks]

**Physics**

During an episode of turbulence in an airplane you feel 190 N heavier than usual. If your mass is 78 kg, what are the magnitude and direction of the airplane's acceleration? For the F=ma, I manipulated the equation and have gotten, a=190N/78kg=2.4 is this correct? And how do I...

**physics**

A motor car of mass 30kg,moving with a velocity of 10m/s. by the application of brakes,it was brought to rest at a distance of 25meters. Find the average force.

**physics**

a boy travel 5km east and then12 km south.calculate his displacement from starting point.

**Physics**

A sailboat is moving across the water at 3.0 m/s. A gust of wind fills its sails and it accelerates at a constant 2.0 m/s2. At the same instant, a motorboat at rest starts its engines and accelerates at 4.0 m/s2. After 3.0 seconds have elapsed, find the velocity of the ...

**Physics**

A rail gun uses electromagnetic energy to accelerate objects quickly over a short distance. In an experiment, a 2.00 kg projectile remains on the rails of the gun for only 2.10x10^-2 s, but in that time it goes from rest to a velocity of 4.00×10^3 m/s. What is the average ...

**Physics**

The United States and South Korean soccer teams are playing in the first round of the World Cup. An American kicks the ball, giving it an initial velocity of 3.6 m/s. The ball rolls a distance of 5.0 m and is then intercepted by a South Korean player. If the ball accelerates ...

**Physics**

The city is trying to figure out how long the traffic light should stay yellow at an intersection. The speed limit on the road is 45.0 km/h and the intersection is 23.0 m wide. A car is traveling at the speed limit in the positive direction and can brake with an acceleration ...

**Physics**

On vacation, your 1400-kg car pulls a 560-kg trailer away from a stoplight with an acceleration of 1.85 m/sz. (a) What is the net force exerted on the trailer? (b) What force does the trailer exert oc the car? (c) What is the net force acting on the car?

**Physics**

Water is lifted out of a well 30.0m deep by a motor rated at 1.00hp. Assuming 90% efficiency, how many kilograms of water can be lifted in 1 min? Answer is 137kg but can not figure it out.

**Physics**

During the S.H.M of simple pendulum, when the bob comes back to its mean position, the displacement gradually decreases, and eventully becomes zero at the equilibrium position, while it is said that its velocity is still maximum despite of zero displacement, then how is it ...

**physics**

A dog running in an open field has components of velocity vx = 2.5 m/s and vy = -1.3 m/s at time t1 = 10.7 s . For the time interval from t1 = 10.7 s to t2 = 23.2 s , the average acceleration of the dog has magnitude 0.54 m/s2 and direction 25.0 ∘ measured from the +x−axis...

**Physics**

A typical photovoltaic cell delivers 4.2×10−3 W of electric energy when illuminated with 0.15 W of light energy. What is the efficiency of the cell?

**Physics**

A block is given an initial velocity of 4.00 m/s up a frictionless incline of angle θ = 21.0°. How far up the incline does the block slide before coming to rest?

**physics**

You have two cylindrical solenoids, one inside the other, with the two cylinders concentric. The outer solenoid has length â„“outer = 400 mm, radius Router = 50 mm, and Nouter = 2000 windings. The inner solenoid has length â„“inner = 40 mm, radius Rinner = 20 mm, and...

**Dynamic n vibration, physics**

A system is represented by the equation: 2x”+128x = f(t) Obtain the free response of the system in the form a) x = A sin wn (t ) + B cos wn (t) b) x= A sin wn (t) + ϕ The initial conditions are x(0) = 0.05m and x’ = 0.3m/s.

**physics**

A billiards ball of mass 0.4kg strikes another, initially stationary ball of the same mass. The first ball is deflected and travels at an angle of 30∘ with its original direction. Its initial speed was 12m/s and after the collision, it is 8m/s. What are the magnitude ...

**Physics**

Water is flowing continuously from a tap having an internal diameter 8×10^-3 m. The water velocity as it leaves the tap is 0.4 m/s. The diameter of the water stream at a distance 2×10^-1 m below the tap is close to: A) 5.0×10^-3m B) 7.5×10^-3m C) 9.6×10^-3m D) 3.6×10^-3m

**physics inertia**

Calculate the moment of inertia of this arrangement of masses. Each mass is located 2.5 m away from the axis. (You can envision the arrangement as a single rotating axis with four masses extending out from the axis like spokes of a wheel.) m1 is 1kg m2 is 2kg m3 is 3kg m4 is ...

**Physics**

Please help me, I am in dire need of it, A football quarterback shows off his skill by throwing a pass {5.70 m downfield and into a bucket. The quarterback consis- tently launches the ball at 38.00' above horizontal, and the bucket is placed at the same level from which the ...

**Physics**

A train slows down as it rounds a sharp horizontal turn, going from 86.0 km/h to 44.0 km/h in the 13.0 s that it takes to round the bend. The radius of the curve is 140 m. Compute the acceleration at the moment the train speed reaches 44.0 km/h. Assume the train continues to ...

**Physics**

A ball is thrown horizontally off a building that is 30 m high with an initial velocity of 3 m/s.if an identical ball is thrown again horizontally from the same height with 6 m/s, what happens to the flight time? A. Flight time is doubled. B. Flight time is decreased by half. ...

**Physics**

A golfer hits a shot to an elevated green. The ball leaves the club with an initial speed of 16 m/s at an angle of 58' above the horizontal. If the speed of the ball just before it lands is 12 m/s, what is the elevation of the green above the point where the ball is struck?

**Physics**

A football player kicks a field goal, launchingthe ball at an angle of 48" above the horizontal. During the kick, the ball is in contact with the player's foot for 0.045 s, and the ball's acceleration is 290 m/sz. Vvhat is the range of the football?

**Physics**

A girl at a ropes course pulls herself upward using a cage and pulley system. There combined mass is 64 kg. A)Calculate the force she pulls down with to raise herself at constant speed. B)Calculate her acceleration if she increases her force by 8%.

**Physics**

Six identical books, 4.0 cm thick and each with a mass of 0.8kg, lie individually on a flat table.How much work would be needed to stack the books one top of the other?

**Physics**

What is the force needed to start a 100 kg block sliding on a horizontal if the coefficients for static and kinetic are 0.75 and 0.5