What is the mass of a bowling ball that exerts a downward force of 160 N on your skull after gently set it on the back of your head while you lay face down on a bed of nails?
Q: A 5kg dog has several balloons tied to it, applying 20 N of upward tension force. How much normal…
A: Mass of the dog M=5 kg The upward tension T=20 N The free body diagram of the dog and balloons are…
Q: If you know all of the forces acting on a moving object, can you tell in which direction the object…
A: Several forces acting on a body
Q: Consider a crate at rest on a factory floor. As a pair of workmen begin lifting it, does the support…
A: Since, as the crate is getting pulled, the force due to gravity which is constant "mg" is balanced…
Q: An 8000-kg engine pulls a 40 000-kg train along a level track and gives it an acceleration 2.4…
A: Mass of engine M=8000 kg, mass of first train M1=40000 kg, acceleration of first train a=2.4 m/s2…
Q: A racing car and a moving van are both traveling at 40 km/h. Which of the two vehicles will require…
A: Given, a racing car and a moving van are both travelling at an initial speed, v1=40 km/h. and,…
Q: Two robotic arms are used to push boxes from one place to another across a smooth surface (assume…
A: Required : Which arm will make the boxes reach a higher speed.
Q: -1.2m/s?, what is the net force acting on the vehicle?
A: negative acceleration means the speed reduces with time. Hence force will be negative means in…
Q: What breaking force is needed to stop a 1200 kg train moving at 25 m/s in a time of 2 seconds?
A: Given data: Mass of the train m =1200kg Speed v= 25 m/s Time t= 2 seconds
Q: A large truck traveling at 40 mi/hr down Lake Avenue collides with a Monarch butterfly that is…
A:
Q: A 40 kg sprinter starts from rest and 2.0 s later is running at a speed of 8.0 m/s. What is the net…
A:
Q: How much horizontal force would be required to make a 15 kg box accelerate at 1.2 m/s if friction…
A: Mass- 15 kg a = 1.2 m/s2 Frictional force = 18 N
Q: A 150-g fish is swimming toward its food with an acceleration of 2 m/s/s. If the amount of friction…
A: Given that Mass m = 150 g Acceleration a = 2 m/s2 Friction force of water is f = 2 N
Q: What is the force due to the acceleration caused by gravity on a mass of 35.7kg if it is placed on…
A:
Q: Superman must stop a 120-km/h train in 200 m to keep it from hitting a stalled car on the tracks. If…
A: Given: Train speed = 120 km/h or 33.33 m/s Distance in which superman has to stop the train = 200 m…
Q: When a bug hits the windshield of a moving car, why does the bug get "squished" while the car…
A: This can be taken as the case of inelastic collision. The car is moving at a very high speed and the…
Q: A 51.5-kg swimmer with an initial speed of 1.25 m>s decides tocoast until she comes to rest. If…
A:
Q: What is the weight in Newton's of a 7.4 kg package of nails?
A: Given Data: The mass of the package of nails is, m=7.4 kg The expression for the weight is,…
Q: What is always true about the direction of a retarding force (such as friction or drag) compared to…
A: Given: Force is retarding force.
Q: Why does a bungee jumper feel weightless during the jump?
A: A bungee jumper feels weightlessness when he jumps the platform. When the jumper is standing on the…
Q: A parachute has the same mass when it is in a pack and when it is spread out, but when the parachute…
A: The mass in both the given cases is identical for the parachute. When the parachute is not spread…
Q: You push a box up a slope with kinetic friction at a constant speed. Which of these is true?
A: Given that if we push a box up a slope with kinetic friction at a constant speed, then which…
Q: A body weighing2 kg was acted upon by a horizontal force of 3 N. What speed will the body acquire in…
A: The physical quantities can be of two types- scalar and vector. The scalar quantities are the…
Q: Why is it difficult to hold a school bag having a strap made of a thin and strong string?
A: It is difficult to hold a school bag having a thin strap because the pressure on the shoulders is…
Q: What acceleration does a baseball of mass 0.35 experience when hit by a bat if 203 N are exerted by…
A:
Q: An 1700 keg elevator has a cable that can support 25,000 N of force. If it carries ten people at 50…
A: Given, mass of an elevator, m = 1700 kg maximum tension, T = 25000 N mass of the person, m = 50 g
Q: A girl weighing 45kg is standing on the floor, exerting a downward force of 200N on the floor. The…
A: Mass of the girl (m)=45kg Force exerted (F) =200 N (In down ward direction)
Q: . The nature of force
A:
Q: In the absence of a net force, an object can be
A: When the net force on an object is zero, it does not mean that there is no external acting on the…
Q: What is the acceleration of a 600,000 kg freight train, if each of its three engines can provide…
A:
Q: Why does a heavy parachutist fall faster than a lighter parachutist who wears a parachute of the…
A:
Q: What force is needed to accelerate a sled ( mass=55kg) at 1.4 m/s2 on horizontal frictionless ice?
A: The definition of force is F = ma
Q: If an object is NOT accelerating, then the forces acting on the object are?
A: Given data The acceleration is a=0 The net force on the object is, Fnet=ma=m0=0 Here m is mass of…
Q: A body begins to slide over the surface of another, when pulled with a force of 10 N, if we pulled…
A: Option C is the right answer 9N
Q: A 9 - kg sled sliding freely in the positive direction on an icy surface experiences a 3-N…
A: According to newton's second law of motion, the acceleration(a) of an object is the ratio of the net…
Q: Your empty hand is not hurt when it bangs lightly against a wall. Why does it hurt if you are…
A: From newton's 2nd law we have,
Q: When you stand still on the ground, how large a force does the ground exert on you? Why doesn’t this…
A: The answer lies in Newton's law Newton's third law of motion. When an object applies force on the…
Q: A force of 50 newtons is exerted by a bat on a baseball. The force exerted by the baseball on the…
A:
Q: If the apparent weight of a man is 840 N when the elevator that moves downward with acceleration 4…
A: Given Data " The weight of the man when the elevator moves down is given as W = 840 N. The…
Q: What is the weight in Newton's of a 5.3 kg package of nails?
A: Given Mass of package m=5.3kg
Q: How does a helicopter gets its lifting force?
A: the helicopter gets the lift by pushing the air downwards and it gets the thrust from the reaction…
Step by step
Solved in 2 steps with 2 images
- A drill rod is used with a air hammer for making holes in hard rock so explosives can be placed in them. How many impulsive forces act on the drill rod during the drilling? Assume the weight of the drill rod is nonimpulsive 2 1,A car traveling at 53 km/h hits a bridge abutment.A passenger in the car moves forward a distance of 65 cm (with respect to the road) while being brought to rest by an inflated air bag.What magnitude of force (assumed constant) acts on the passenger’s upper torso, which has a mass of 41 kg?A car traveling at 56 km/h hits a bridge abutment. A passenger in the car moves forward a distance of 56 cm (with respect to the road) while being brought to rest by an inflated air bag. What magnitude of force (assumed constant) acts on the passenger's upper torso, which has a mass of 40 kg?
- Bank robbers have pushed a 1000 kg safe to a second-story floor-to-ceiling window. They plan to break the window, then lower the safe 3.0 m to their truck. Not being too clever, they stack up 500 kg of furniture, tie a rope between the safe and the furniture, and place the rope over a pulley. Then they push the safe out the window. The problem was that the acceleration was too large and the safe slammed on the truck withlarge velocity (6.1 m/s), breaking through the truck floor.Now the robbers decide they learned their lesson. They plan to redo this action and decide that thesafe should not hit the (new) truck with velocity greater than 1.5 m/s.What is the maximum acceleration that the safe can have in order to limit the impact velocity to1.5 m/s?Bank robbers have pushed a 1000 kg safe to a second-story floor-to-ceiling window. They plan to break the window, then lower the safe 3.0 m to their truck. Not being too clever, they stack up 500 kg of furniture, tie a rope between the safe and the furniture, and place the rope over a pulley. Then they push the safe out the window. The problem was that the acceleration was too large and the safe slammed on the truck withlarge velocity (6.1 m/s), breaking through the truck floor.Now the robbers decide they learned their lesson. They plan to redo this action and decide that thesafe should not hit the (new) truck with velocity greater than 1.5 m/s.What is the maximum acceleration that the safe can have in order to limit the impact velocity to1.5 m/s? Draw a sketch using the free body diagram of each step.Bank robbers have pushed a 1000 kg safe to a second-story floor-to-ceiling window. They plan to break the window, then lower the safe 3.0 m to their truck. Not being too clever, they stack up 500 kg of furniture, tie a rope between the safe and the furniture, and place the rope over a pulley. Then they push the safe out the window. The problem was that the acceleration was too large and the safe slammed on the truck withlarge velocity (6.1 m/s), breaking through the truck floor.Now the robbers decide they learned their lesson. They plan to redo this action and decide that thesafe should not hit the (new) truck with velocity greater than 1.5 m/s.What is the maximum acceleration that the safe can have in order to limit the impact velocity to1.5 m/s? What is the minimum coefficient of friction that they need to have this work?
- A 75-kg petty thief wants to escape from a third-story jail window. Unfortunately, a makeshift rope made of sheets tied together can support a mass of only 58 kg. How might the thief use this “rope” to escape? Give a quantitative answer.If a 0.50-kg block initially at rest on a frictionless, horizontal surface is acted upon by a force of 2.7 N for a distance of 3.9 m, then what would be the block's velocity?A person steps horizontally off the roof of a single-story house that is 3.1 m high. When his feet hit theground below, he bends his knees such that his torso decelerates over a distance of 0.65 m before coming to astop. If the mass of his torso is 50 kg, what is the average net force exerted on his torso over this distance?
- A person jumps then leaves the floor with a velocity of 1.20 m/s upward. If the person is in contact with the floor for 0.280s during the jump. What is the net force exerted by the floor on the person? The mass of the person is 80.0 kg.The Harrier Jump Jet is a fixed wing military jet designed for vertical takeoff and landing (VTOL). It is capable of rotating its jets from a horizontal to a vertical orientation in order to takeoff, land and conduct horizontal maneuvers. Determine the vertical thrust required to accelerate an 8600-kg Harrier upward at 0.40 m/s/s.When blocking in football, a defending lineman often attempts to get his body under the body of his opponent and push upward. What effect does this have on the friction force between the opposing lineman’s feet and the ground?