A 10-kg box is pushed up a plane inclined at 37º with the horizontal.The box starts from rest and is pushed 5 m along the incline with a uniform acceleration of 2 m/s2.The coefficient of kinetic friction is 0.20 and the pushing force is parallel to the plane.The increase in the potential energy of the box is

A) 0.10 kJ B) 0.29 kJ C) 0.36 kJ D) 0.46 kJ E) 0.39 kJ A) 0.10 kJ B) 0.29 kJ C) 0.36 kJ D) 0.46 kJ E) 0.39 kJ

Calculate the work done by a force, ,around a closed path,first going from P1 (1,1)to P2 (4,4)along path a and returning along path b.

A) 0 J B) 3 J C) 7 J D) 13 J E) 17 J A) 0 J B) 3 J C) 7 J D) 13 J E) 17 J

Calculate the work done by a force, ,along the path (0,0)$\to$P1 (2,0)$\to$ P2 (2,2).

A) 2 J B) 4 J C) 6 J D) 8 J E) 10 J A) 2 J B) 4 J C) 6 J D) 8 J E) 10 J

Exam 7: Conservation of Energy

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Use the figure to the right to answer the next problem. An object of mass m = 100 g slides down without rolling a rough incline from a height H = 60 cm.At h = 30 cm,the object flies off the incline.The coefficient of kinetic friction is 0.4,and the angle = 30 -How far from the base of the elevated incline does the object hit the floor?

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Question 41

A 10-kg box is pushed up a plane inclined at 37º with the horizontal.The box starts from rest and is pushed 5 m along the incline with a uniform acceleration of 2 m/s².The coefficient of kinetic friction is 0.20 and the pushing force is parallel to the plane.The increase in the potential energy of the box is

(Multiple Choice)

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Question 42

Use the figure to the right to answer the next problem. An object of mass m = 100 g slides down without rolling a rough incline from a height H = 60 cm.At h = 30 cm,the object flies off the incline.The coefficient of kinetic friction is 0.4,and the angle = 30 -What is the speed of the object just after it leaves the ramp?

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Question 43

A 10-kg box is at the top of a 5-m plane inclined at 37º with the horizontal.The box starts from rest and slides down the plane.The coefficient of kinetic friction is 0.20.The magnitude of the change in the potential energy of the box is

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Question 44

A 5200-kg cable car in Hong Kong is pulled a distance of 360 m up a hill inclined at 12º from the horizontal.The change in the potential energy of the car is

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Question 45

Which of the following statements is true?

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Question 46

When an electron in a hydrogen atom jumps from n = 2 to n = 1,the photon emitted is of frequency f = 4.572 $\times$ 10¹⁴ Hz.What is the energy of the photon?

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Question 47

Calculate the work done by a force, ,around a closed path,first going from P₁ (1,1)to P₂ (4,4)along path a and returning along path b.

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Question 48

Calculate the work done by a force, $Calculate the work done by a force, ,along the path (0,0) \to P1 (2,0) \to P2 (2,2).$ ,along the path (0,0) $\to$ P₁ (2,0) $\to$ P₂ (2,2). $Calculate the work done by a force, ,along the path (0,0) \to P1 (2,0) \to P2 (2,2).$

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Question 49

A 75-kg man climbs the stairs to the fifth floor of a building,a total height of 16 m.His potential energy has increased by

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Question 50

A mass m is released from a height 80 cm from the right-hand side of the track shown in the diagram at right.There is only friction acting along the horizontal portion 30 cm either side of the midpoint O with a kinetic coefficient of friction of $\mu$ _k = 0.4.Determine (i)how many times does the mass m pass through the midpoint O,and (ii)how far from the midpoint does it come to rest. $A mass m is released from a height 80 cm from the right-hand side of the track shown in the diagram at right.There is only friction acting along the horizontal portion 30 cm either side of the midpoint O with a kinetic coefficient of friction of \mu k = 0.4.Determine (i)how many times does the mass m pass through the midpoint O,and (ii)how far from the midpoint does it come to rest.$

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Question 51

What is the kinetic energy of the object at point P₂?

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Question 52

A woman runs up a flight of stairs.The gain in her gravitational potential energy is U.If she runs up the same stairs with twice the speed,what is her gain in potential energy?

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Question 53

A child is sitting on the seat of a swing with ropes 10 m long.Her father pulls the swing back until the ropes make a 37º angle with the vertical and then releases the swing.If air resistance is neglected,what is the speed of the child at the bottom of the arc of the swing when the ropes are vertical?

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Question 54

A mass,m,slides down a frictionless incline and hits a spring with spring constant k.Find the spring compression when the acceleration of the mass is zero.

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Question 55

A spring with force constant k = 300 N/m is compressed 9.0 cm.What is the potential energy in the spring?

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Question 56

Showing 41 - 56 of 56

Exam 7: Conservation of Energy

A 10-kg box is at the top of a 5-m plane inclined at 37º with the horizontal.The box starts from rest and slides down the plane.The coefficient of kinetic friction is 0.20.The magnitude of the change in the potential energy of the box is

A 5200-kg cable car in Hong Kong is pulled a distance of 360 m up a hill inclined at 12º from the horizontal.The change in the potential energy of the car is

Which of the following statements is true?

When an electron in a hydrogen atom jumps from n = 2 to n = 1,the photon emitted is of frequency f = 4.572 ×\times× 1014 Hz.What is the energy of the photon?

Calculate the work done by a force, ,around a closed path,first going from P1 (1,1)to P2 (4,4)along path a and returning along path b.

Calculate the work done by a force, ,along the path (0,0) →\to→ P1 (2,0) →\to→ P2 (2,2).

A 75-kg man climbs the stairs to the fifth floor of a building,a total height of 16 m.His potential energy has increased by

What is the kinetic energy of the object at point P2?

A woman runs up a flight of stairs.The gain in her gravitational potential energy is U.If she runs up the same stairs with twice the speed,what is her gain in potential energy?

A mass,m,slides down a frictionless incline and hits a spring with spring constant k.Find the spring compression when the acceleration of the mass is zero.

A spring with force constant k = 300 N/m is compressed 9.0 cm.What is the potential energy in the spring?

Systems of Measurement

Motion in One Dimension

Motion in Two and Three Dimensions

Newtons Laws

Applications of Newtons Laws

Work and Energy

Systems of Particles and Conservation of Linear Momentum

Rotation

Conservation of Angular Momentum

Gravity

Static Equilibrium and Elasticity

Fluids

Oscillations

Wave Motion

Superposition and Standing Waves

Temperature and the Kinetic Theory of Gases

Heat and the First Law of Thermodynamics

The Second Law of Thermodynamics

Thermal Properties and Processes

The Electric Field I: Discrete Charge Distributions

The Electric Field Ii: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Magnetic Induction

Alternating-Current Circuits

Maxwells Equations and Electromagnetic Waves

Properties of Light

Optical Images

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

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Elementary Particles and the Beginning of the Universe

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When an electron in a hydrogen atom jumps from n = 2 to n = 1,the photon emitted is of frequency f = 4.572 $\times$ 10¹⁴ Hz.What is the energy of the photon?

Calculate the work done by a force, ,around a closed path,first going from P₁ (1,1)to P₂ (4,4)along path a and returning along path b.

What is the kinetic energy of the object at point P₂?