A 7.80-g bullet moving at 470 m/s penetrates a tree trunk to a depth of 5.60 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. N (b) Assuming the friction force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving. s

Q: Khufra works at a spring factory and he was assigned to test a certain spring, whose constant is 50…

A: Work done is defined as  W =F→.S→If force and displacement is in same direction thenW =FSIf force…

Q: As Chinook salmon swim upstream in theYukon River to spawn, they must travel about 3000 km in…

A:

Q: A 3.0 kg object is moving along the x-axis in a region where its potential energy as a function of x…

A: Acceleration is defined as the rate of change of velocity with time. The net force acting on a…

Q: Using energy considerations, calculate the average force (in N) a 60.0 kg sprinter exerts backward…

A:

Q: A constant horizontal force moves a 50 kg trunk 9.4 m up a 28° Incline at constant speed. The…

A:

Q: A 44.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 140…

A: Given :Mass of projectile is 44 kgAngle of projectile is 30°Initial speed is 140 m/sHeight of cliff…

Q: A crate of mass 10 kg is pulled up a rough incline with an initial speed of 1.5 m/s. The pulling…

A:

Q: A rope is tied to a box and used to pull the box 1.6 m along a horizontal floor. The rope makes an…

A: Given: The length of the horizontal floor is 1.6 m. The rope angle with horizontal is 30°. The…

Q: (a) How long will it take an 850-kg car with a useful power output of 40.0 hp (1 hp equals 746 W) to…

A: It is given that,

Q: A block with mass m = 2.5 kg slides head-on to a spring with spring constant k = 320 N/m . When the…

A: Given data: Mass of the block m = 2.5kg Spring constant k =320 N/m Compressed length x= 25.0 cm…

Q: A 60.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 142…

A:

Q: 72. A 1400-kg car ascends a mountain road at a steady 60 km/h, against a 550-N force of air…

A: 72)m = 1400 kg v = 60km/h f = 550 N (friction)P = 38 kW

Q: Using energy considerations, calculate the average force (in N) a 60.0 kg sprinter exerts backward…

A:

Q: Problem 8.68 A 1150 kg sports car accelerates from rest to 95 km/h in 7.1 s Part A What is the…

A: Solution: Given that Mass of the car m=1150 kg Initial velocity of car v1​=0 t = 7.1 s Final…

Q: A 42.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 122…

A:

Q: A 42.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 136…

A:

Q: In a retail centre, a 137 lbs guy rides an escalator. The escalator transports the user at a steady…

A:

Q: A 4.00 g bullet moving at 610 m/s penetrates a tree trunk to a depth of 46 mm. (a) Use the…

A: Part (a) solution

Q: A 46.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 122…

A:

Q: A person drags a box across a floor by applying a horizontal force of 10 N. The kinetic frictional…

A: Given: The applied force is F=10 N. The frictional force is Ff=4 N. The displacement is d=0.5 m.…

Q: A 2.50 kg box is pulled by a constant force of 16 N that is exerted at an angle 36.9° above the…

A: given,Iitial speed,vi=0applied force, F=16 Ndistance d=3 mcoefficient of friction= 0.21

Q: A 40.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of…

A: Given data: Mass of the projectile is, m= 40 kg Angle of projection is, θ=300 Initial speed is,…

Q: A 250 g block is dropped onto a relaxed vertical spring that has a spring constant of k =2.5…

A: a)     The required work done by gravitational force is, b)   The required work done by spring…

Q: The work done on a stretching a spring it to 3.50 cm from its equilibrium length is 14.0 J. (a) How…

A: Stretching in spring = 3.50 cm Work done = 14 J

Q: 1. A 58.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of…

A:

Q: A 44.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 140…

A:

Q: A 60.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 138…

A: Given: The mass of the projectile is 60.0 kg. The angle of projection is 30.0 degrees. The initial…

Q: Khufra works at a spring factory and he was assigned to test a certain spring, whose constant is 50…

A: Given  force constant (k)=50 N/m mass of block =50 kg incline angle=300 displacement(x)=0.5 m…

Q: A 40.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 130…

A: Given:-  mass of the projectile m= 40 kg  Initial speed v= 130 m/s  h= 132 m  θ=30° Find:- (a) What…

Q: A 50 g ball is thrown from a window with an initial velocity of 8.0 m/s at an angle of 30 above the…

A: (a) kinetic energy of the ball at the top of its flight

Q: A 300 g block is dropped onto a relaxed vertical spring that has a spring constant of k = 1.1 N/cm…

A:

Q: A child of mass m starts from rest and slides with- out friction from a height h along a curved…

A: Since we are entitled to answer up to 3 sub-parts, we’ll answer the first 3 as you have not…

Q: Khufra works at a spring factory and he was assigned to test a certain spring, whose constant is 50…

A: (a) Free body diagram:

Q: A 1900-kg pile driver is used to drive a steel beam into the ground. The pile driver falls 6.00 m…

A: Given: mdriver=1900kgyi,driver=6.09myf,driver=0mvf,driver=vi,driver=0m/sThe distance travelled by…

Q: ASK YOU A 7.80 g bullet is initially moving at 620 m/s just before it penetrates a block of wood to…

A: Given data: Mass of bullet is, m=7.80 g=7.80×10-3 kg. Initial speed of bullet is, u=620 m/s. Depth…

Q: A 40.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 130…

A:

Q: Khufra works at a spring factory and he was assigned to test a certain spring, whose constant is 50…

A: We know spring force as the block is moved right or left, always in the opposite direction as the…

Q: A 50.0 kg extreme snowboarder slides down the side of a mountain that is inclined at an angle of…

A:

Q: A 2.50 kg box is pulled by a constant force of 16 N that is exerted at an angle 36.9° above the…

A:

Q: A 42.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 136…

A:

Q: A 10 kg crate is pulled along a rough inclined plane at an initial velocity of 1.5 m / s. The…

A: Given The mass of crate is m=10 kg. The initial velocity of the crate is v=1.5 m/s. The pulling…

Q: A football player, with a mass of 60.0 kg, slides on the ground after being knocked down. At the…

A: Given: mass of player, m = 60 kg initial speed of player, u = 3.90 m/s final speed of player, v = 0…

Q: Consider a system of a cliff diver and the earth. The gravitational potential energy of the system…

A: Given data:  Decrease in Gravitational Potential Energy = 23,000 J Height (h) = 44.0 m Required: The…

Q: 13.lf it takes total work W to give an object a speed v and kinetic energy K, starting from rest,…

A:

Q: Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 90.0 kg, down a 60.0º…

A: Work done by a force over a displacement can be calculated using the following relation. W=Fd cosθ…

Q: Using energy considerations, calculate the average force (in N) a 60.0 kg sprinter exerts backward…

A: Given: The mass of the sprinter: m = 60.0 kg. The initial velocity: vi = 2.00 m/s. The final…

Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.