1. Once the crate in sample problem d is in motion, a horizontal force of 53 n keeps the crate moving with constant velocity find the coefficient of kinetic friction between the crate and the floor. = 53N/( 24 kg • 9.8 N/Kg) = 0.32
2. A 25 kg chair initially at rest on a horizontal floor requires a 165 N horizontal force to set it in motion. Once the chair is in motion, a 127 N horizontal force keeps it moving at a constant velocity. A)Find the coefficient of static friction between the chair and the floor. = 0.673 B) Find the coefficient of kinetic friction between the chair and the floor. = 0.518
3. A museum curator moves artifacts into place on various different display surfaces. A) moving a 145kg aluminum sculpture across a horizontal steel platform. Aluminum on Steel - ,us 0.61 ,uk 0.47 =867 N 668 N
B) pulling a 15kg steel sword across a horizontal steel shield. Steel on Steel - ,us 0.74 ,uk 0.57 = 109 N 83.8 N
C) pushing a 250kg wood bed on a horizontal wood floor. Wood on Wood - ,us 0.4 ,uk 0.2 = 900 N 444 N
D) sliding a 0.55kg glass amulet on a horizontal glass display case. Glass on Glass - ,us 0.9 ,uk 0.4 = 4.9 N 2 N
1) heather and Matthew walk with an average velocity of 0.98 m/s eastward if it takes them 34 min to walk yo the shore, what is their displacement? Distance = velocity * time = .98(m/s)*(34min*60s/min) = 1999.2 m
2) if joe rides his bicycle in a straight line for 15 min with an average velocity of 12.5 km/h south, how far as he ridden? 3.125 km
3) It takes you 9.5 minutes to walk with an average velocity of 1.2m/s to the north from the bus stop. What is your displacement? 9.5 minutes = 570 , 570 seconds *1.2 per second = 684 meters displacement.
4) Simpson drives his car with a average velocity of 48.0 km/h to the east. How long will it take him to drive 144 km on a straight highway? distance to be covered 144 Km. distance to be covered 144 Km.
5) look back to number 4. how much time would Simpson save if he traveled the same distance at an average velocity of 56.0 km/h to the east. t = 144km/56km/h = 2.57 hr --> he saves 3-2.57=0.43 hr = 27.6 min.
6) A bus travels 280 km south along a straight path with an average velocity of 88 km/h to the south. The bus stops for 24 min. Then, it travels 210 km south with an average velocity of 75 km/h to the south. How long does the total trip last A) how long does the total trip lasts?= 6.38
B) What is the average velocity for the total trip?= 76.8
1) A car accelerates uniformly from rest to a speed of 23.7 km/h in 6.5 s. What is the distance the car travels during this time?= 21.125
2) When Maggie applies the brakes of her car, the car slows uniformly from 15.0 m/s to 0.0 m/s in 2.50 s. How many meters before a stop sign must she apply her brakes in order to stop at the sign?18.75m
3) A driver in a car traveling at a speed of 78 km/h sees a cat 101 m away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 99 m? Dt= 9.1 seconds
4) A car enters the freeway with a speed of 6.4 m/s and accelerates uniformly for 3.2 km in 3.5 min. How fast is the car moving after this time? Vf= 24 m/s2
1) find the velocity after the stroller in sample problem e has traveled 6.32.
2) A car traveling initially at +7.0 m/s accelerates uniformly at the rate of +0.80 m/s2 for a distance of 245 m. a) What is its velocity at the end of the acceleration? V245 = 21 m/8 b) What is its velocity after it accelerates for 125 m? V125 = 15.78 m/8 c) What is its velocity after it accelerates for 67 m? V67 = 12.5 m/8 3) a car accelerates uniformly in a straight line from rest at the rate of 2.3m/s2. a) V= 15.9m/s2 b) 6.92s = t 4) A motorboat accelerates uniformly from a velocity of 6.5 m/s to the west to a velocity of 1.5 m/s to the west. If its acceleration was 2.7 m/s2 to the east, how far did it travel during the acceleration? 7.4m
5) An aircraft has a liftoff speed of 33 m/s. What minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 240 m? 2.27m/s2
6) A certain car is capable of accelerating at a uniform rate of 0.85 m/s2. What is the magnitude of the car's displacement as it accelerates uniformly from a speed of 83 km/h to one of 94 km/h? = 88m I accidentally didn't send this homework
1) If a car is traveling westward with a constant speed of 20 m/s, what is the resultant force acting on it? As the speed is constant, there is no force. Newton's First Law: Every body continues in its state of rest or uniform motion in a straight line unless it is acted on by a force.
2) If a car is accelerating downhill under a net force of 3674 N, what additional force would cause the car to have a constant velocity? you would need a force of –3674 N, so the net force is zero.
3) the sensor in the torso of a crash-test dummy records the magnitude and direction of the net force acting on the dummy. if the dummy is thrown forward with a force of 130.0 N while simultaneously being hit from side with a force of 4500.0 N, what force will the sensor report? F= 4501.88 N
4) WHAT FORCE WILL THE SEAT BELT HAVE TO EXERT ON THE DUMMY IN THE QUESTION ABOVE, TO HOLD THE DUMMY IN THE SEAT? 4502n, 88.3
5) can an object be in equilibrium if only one force acts on the object? No, either no force or nor more forces and regained.
1) the net force on the propeller of a 3.2 kg model airplane is 7.0 n forward. What is the acceleration of the airplane? 2.2 m/s2 2) The net force on a golf cart is 390 N north. If the cart has a total mass of 270 Kg, what are the magnitude and direction of its acceleration? The magnitude of its acceleration is 1.44ms/2 in the north direction.
3) A car has a mass of 1.5X10^3 Kg. If the force acting on the car is 6.75X10^3 N to the east, what is the car's acceleration? a=4.5 m/s^2 to the east.
4) A soccer ball kicked with a force of 13.5 N accelerates at 6.5 m/s^2 to the right. What is the mass of the ball? m=2.1 kg.
5) A 2.0Kg otter starts from rest at the top of a muddy incline 85cm long and slides down to the bottom in 0.50 s. What net external force acts on the otter along the incline? F=14 N.
1. Once the crate in sample problem d is in motion, a horizontal force of 53 n keeps the crate moving with constant velocity find the coefficient of kinetic friction between the crate and the floor. = 53N/( 24 kg • 9.8 N/Kg) = 0.32
ReplyDelete2. A 25 kg chair initially at rest on a horizontal floor requires a 165 N horizontal force to set it in motion. Once the chair is in motion, a 127 N horizontal force keeps it moving at a constant velocity. A)Find the coefficient of static friction between the chair and the floor. = 0.673
B) Find the coefficient of kinetic friction between the chair and the floor. = 0.518
3. A museum curator moves artifacts into place on various different display surfaces.
A) moving a 145kg aluminum sculpture across a horizontal steel platform. Aluminum on Steel - ,us 0.61 ,uk 0.47 =867 N 668 N
B) pulling a 15kg steel sword across a horizontal steel shield. Steel on Steel - ,us 0.74 ,uk 0.57 = 109 N 83.8 N
C) pushing a 250kg wood bed on a horizontal wood floor. Wood on Wood - ,us 0.4 ,uk 0.2 = 900 N 444 N
D) sliding a 0.55kg glass amulet on a horizontal glass display case. Glass on Glass - ,us 0.9 ,uk 0.4 = 4.9 N 2 N
1) heather and Matthew walk with an average velocity of 0.98 m/s eastward if it takes them 34 min to walk yo the shore, what is their displacement? Distance = velocity * time = .98(m/s)*(34min*60s/min) = 1999.2 m
ReplyDelete2) if joe rides his bicycle in a straight line for 15 min with an average velocity of 12.5 km/h south, how far as he ridden? 3.125 km
3) It takes you 9.5 minutes to walk with an average velocity of 1.2m/s to the north from the bus stop. What is your displacement? 9.5 minutes = 570 , 570 seconds *1.2 per second = 684 meters displacement.
4) Simpson drives his car with a average velocity of 48.0 km/h to the east. How long will it take him to drive 144 km on a straight highway? distance to be covered 144 Km. distance to be covered 144 Km.
5) look back to number 4. how much time would Simpson save if he traveled the same distance at an average velocity of 56.0 km/h to the east. t = 144km/56km/h = 2.57 hr --> he saves 3-2.57=0.43 hr = 27.6 min.
6) A bus travels 280 km south along a straight path with an average velocity of 88 km/h to the south. The bus stops for 24 min. Then, it travels 210 km south with an average velocity of 75 km/h to the south. How long does the total trip last A) how long does the total trip lasts?= 6.38
B) What is the average velocity for the total trip?= 76.8
1) A car accelerates uniformly from rest to a speed of 23.7 km/h in 6.5 s. What is the distance the car travels during this time?= 21.125
2) When Maggie applies the brakes of her car, the car slows uniformly from 15.0 m/s to 0.0 m/s in 2.50 s. How many meters before a stop sign must she apply her brakes in order to stop at the sign?18.75m
3) A driver in a car traveling at a speed of 78 km/h sees a cat 101 m away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 99 m? Dt= 9.1 seconds
4) A car enters the freeway with a speed of 6.4 m/s and accelerates uniformly for 3.2 km in 3.5 min. How fast is the car moving after this time? Vf= 24 m/s2
1) find the velocity after the stroller in sample problem e has traveled 6.32.
2) A car traveling initially at +7.0 m/s accelerates uniformly at the rate of +0.80 m/s2 for a distance of 245 m.
a) What is its velocity at the end of the acceleration? V245 = 21 m/8
b) What is its velocity after it accelerates for 125 m? V125 = 15.78 m/8
c) What is its velocity after it accelerates for 67 m? V67 = 12.5 m/8
3) a car accelerates uniformly in a straight line from rest at the rate of 2.3m/s2.
a) V= 15.9m/s2
b) 6.92s = t
4) A motorboat accelerates uniformly from a velocity of 6.5 m/s to the west to a velocity of 1.5 m/s to the west. If its acceleration was 2.7 m/s2 to the east, how far did it travel during the acceleration? 7.4m
5) An aircraft has a liftoff speed of 33 m/s. What minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 240 m? 2.27m/s2
6) A certain car is capable of accelerating at a uniform rate of 0.85 m/s2. What is the magnitude of the car's displacement as it accelerates uniformly from a speed of 83 km/h to one of 94 km/h? = 88m I accidentally didn't send this homework
1) If a car is traveling westward with a constant speed of 20 m/s, what is the resultant force acting on it? As the speed is constant, there is no force.
ReplyDeleteNewton's First Law: Every body continues in its state of rest or uniform motion in a straight line unless it is acted on by a force.
2) If a car is accelerating downhill under a net force of 3674 N, what additional force would cause the car to have a constant velocity? you would need a force of –3674 N, so the net force is zero.
3) the sensor in the torso of a crash-test dummy records the magnitude and direction of the net force acting on the dummy. if the dummy is thrown forward with a force of 130.0 N while simultaneously being hit from side with a force of 4500.0 N, what force will the sensor report? F= 4501.88 N
4) WHAT FORCE WILL THE SEAT BELT HAVE TO EXERT ON THE DUMMY IN THE QUESTION ABOVE, TO HOLD THE DUMMY IN THE SEAT? 4502n, 88.3
5) can an object be in equilibrium if only one force acts on the object? No, either no force or nor more forces and regained.
1) the net force on the propeller of a 3.2 kg model airplane is 7.0 n forward. What is the acceleration of the airplane? 2.2 m/s2
2) The net force on a golf cart is 390 N north. If the cart has a total mass of 270 Kg, what are the magnitude and direction of its acceleration? The magnitude of its acceleration is 1.44ms/2 in the north direction.
3) A car has a mass of 1.5X10^3 Kg. If the force acting on the car is 6.75X10^3 N to the east, what is the car's acceleration? a=4.5 m/s^2 to the east.
4) A soccer ball kicked with a force of 13.5 N accelerates at 6.5 m/s^2 to the right. What is the mass of the ball? m=2.1 kg.
5) A 2.0Kg otter starts from rest at the top of a muddy incline 85cm long and slides down to the bottom in 0.50 s. What net external force acts on the otter along the incline? F=14 N.