1.D Which of the following statements is true and why? A. speed can be negative. B....

1.D Which of the following statements is true and why?

A. speed can be negative.

B. acceleration is always positive.

C. constant speed implies constant velocity.

D. acceleration and velocity always have the same direction.

E. constant velocity implies constant speed.

2.A If a net non-zero force is acting on an object, which of the following must be true?

A. The object is moving with constant velocity.

B. The speed is increasing.

C. The speed is changing.

D. The object has a non-zero acceleration.

E. The acceleration is changing

5.A What is impulse and what is momentum? How can the second Newton’s law be formulated these concepts?

7.A A spring-loaded toy gun is used to launch a 5-gram plastic ball. The compressed spring in the gun stores 0.025 J of energy. When the trigger is pulled the spring is released and shoots the ball back out. If all the spring energy is transferred to the ball, what is the ball's speed as it leaves the barrel?

7.B A 1.5-kg cart starts at rest at the top of the frictionless hill shown below. When it reaches the bottom it is traveling at 30 m/sec. What is the height of the hill?

7.C A 400-gram ball is released from a 180 cm height above the floor (with zero initial velocity). At the moment just before it reaches the floor its speed is measured to be 5.92 m/s. How much energy was lost into heat?

8.A A 500-kg sports car accelerates from rest to 30 m/s in 10 seconds. What is the power of the car’s engine?

8.B The brain consumes energy at 10 times the rate of the rest of the body per gram of tissue. The average power consumption of a typical adult’s brain about 20 W. How much energy on average is consumed by brain during a 2-hr exams?

8.C An elevator motor lifts a 1000-kg elevator a height of 60 meters. How much power must the motor supply to do this in 40 sec at a constant speed?

Solutions

Expert Solution

genius_generous answered 1 year ago

Next > < Previous

Related Solutions

Which of the following statements is correct? a. None of these statements are true. b. An...

Which of the following statements is correct? a. None of these statements are true. b. An initiator promotes the effectiveness of a reaction and is recoverable. c. An initiator is consumed by the reaction. d. An initiator serves to hold a polymer chain in a particular orientation,

Which of the following statements are true and which are false? The decimal reduction time D...

Which of the following statements are true and which are false? The decimal reduction time D is the heating time in min at a certain temperature required for the number of viable microbes to be reduced to 10% of the original number. The z value is the temperature increase required for a ten-fold decrease in D. Thermal death time is the heating time required to give commercial sterility. Thermal death time does not depend on the initial microbial load. The...

1) Which of the following statements is true? A. A change in the market price can...

1) Which of the following statements is true? A. A change in the market price can only shift the demand curve. B. A decrease in supply causes equilibrium price to rise; the increase in price then results in a decrease in demand. C. If both demand and supply increase there must be an increase in equilibrium price; equilibrium quantity may either increase or decrease. D. If demand decreases and supply increases one cannot determine if equilibrium price will increase or...

Determine which of the following statements are true and which are false and why? (a) There...

Determine which of the following statements are true and which are false and why? (a) There always exist a Pareto efficient alternative. b) There always exist a Pareto dominated alternative. (c) The best alternative according to Rawlsian Justice is always Pareto efficient. (d) The best alternative according to Borda rule is always Pareto efficient.

1) Which of the following statements is true? A. A common cost can be easily traced...

1) Which of the following statements is true? A. A common cost can be easily traced to a cost object. B. Some of the prime costs are period costs. C. Discretionary fixed costs may not be altered in the short term by current managerial decisions. D. All sunk costs should be ignored in making a decision. E. None of the product costs are fixed costs. 2) Basil company produces special raincoats. Their manufacturing overhead costs are all fixed. The cost...

Determine which of the following statements are: (a) true for systems flowcharts only, (b) true for...

Determine which of the following statements are: (a) true for systems flowcharts only, (b) true for data flow diagrams only, (c) true for both or (d) true for neither. 1) Can be prepared using information technology tools 2) Clearly specifies responsibility for business processes 3) Commonly thought of as the one best way to represent an AIS 4) Incorporates verb phrases to label processes 5) Labels data flows between processes 6) May span multiple pages 7) Processes can be represented...

1) Which of the following statements is (are) true? I.An excited atom can return to its...

1) Which of the following statements is (are) true? I.An excited atom can return to its ground state by absorbing electromagnetic radiation. II.The energy of an atom is increased when electromagnetic radiation is emitted from it. III.The energy of electromagnetic radiation increases as its frequency increases. IV.An electron in the n = 4 state in the hydrogen atom can go to the n = 2 state by emitting electromagnetic radiation at the appropriate frequency. V.The frequency and wavelength of electromagnetic...

Identify which of the following statements is true and which is false. 1) _________ For a...

Identify which of the following statements is true and which is false. 1) _________ For a set of numerical data, if the mean is larger than the median, this is evidence of right-skew. 2) _________ Negative values of the standard deviation indicate that the set of values is even less dispersed than would be expected by chance alone. 3) _________ For a set of numerical data, if the mean and the median are of equal value, this is evidence of...

Which of the following statements are TRUE or False. (Explain why it’s true or false?) Subtracting...

Which of the following statements are TRUE or False. (Explain why it’s true or false?) Subtracting a positive number from a negative number always gives you a negative number. Subtracting two negative numbers always gives you a negative number. Subtracting a - b is the same as adding a + (-b). A positive number minus a negative number is always a positive number. The difference of a number and its opposite gives you zero. Zero minus a number is the...

Which of the following statements are true?

Which of the following statements are true? 1. Fats that contain more saturated fatty acid residues than unsaturated fatty acid residues are more likely to be solid at room temperature. 2. Triacylglycerols (triglycerides) contain ester bonds. 3. Saturated fats have lower melting points than do unsaturated fats. 4. Triacylglycerols (triglycerides) always contain three identical fatty acids. 5. Unsaturated fats are more likely than saturated fats to be liquid at room temperature.

Subjects