Algotssleeddynf
2021-12-17
Answered

A cup of coffee at $90}^{\circ$ C is put into a $20}^{\circ$ C room when t=0. The coffe's temperature is changing at a rate of $r\left(t\right)=-7{e}^{-0.1{t}^{\circ}}$ C per minute, with t in minutes. Estimate the coffee's temperature when t=10

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autormtak0w

Answered 2021-12-18
Author has **31** answers

The coffes

asked 2021-02-21

A 0.75-kg ball is attached to a 1.0-m rope and whirled in avertical circle. The rope will break when the tension exceeds 450 N. What is the maximum speed theball can have at the bottom of the circle without breaking the rope?

A) 38 m/s

B) 16 m/s

C) 12 m/s

D) 24 m/s

E) 32 m/s

A) 38 m/s

B) 16 m/s

C) 12 m/s

D) 24 m/s

E) 32 m/s

asked 2021-03-26

A pair of forces with equal magnitudes, opposite directions,and different lines of action is called a "couple". When acouple acts on a rigid object, the couple produces a torque thatdoes not depend on the location of the axis. The drawing shows acouple acting on a tire wrench, each force being perpendicular tothe wrench. Determine an expression for the torque produced by thecouple when the axis is perpendicular to the tired and passesthrough (a) point A, (b) point B, and (c) point C. Express youranswers in terms of the magnitude F of the force and the length Lof the wrench

asked 2020-12-21

Which of the following is a correct comment?

*/ Comments */

** Comment **

/* Comment */

{ Comment }

Which of the following is not a correct variable type?

float

int

real

double

*/ Comments */

** Comment **

/* Comment */

{ Comment }

Which of the following is not a correct variable type?

float

int

real

double

asked 2021-01-31

For tests using a ballistocardiograph, a patient lies on a horizontal platform that is supported on jets of air. Because of the air jets, the friction impeding the horizontal motion of the platform is negligible. Each time the heart beats, blood is pushed out of the heart in a direction that is nearly parallel to the platform. Since momentum must be conserved, the body and the platform recoil, and this recoil can be detected to provide information about the heart. For each beat, suppose that 0.050 kg of blood is pushed out of the heart with a velocity of +0.30 m/s and that the mass of the patient and the platform is 85 kg. Assuming that the patient does not slip with respect to the platform, and that the patient and the platform start from rest, determine the recoil velocity.

asked 2021-09-26

The government of a large city needs to determine whether the citys

asked 2021-12-19

How many rows and columns are in an

asked 2022-05-23

The owner of Gilley's Ice Cream Parlor has noticed that she sells more ice cream on hotter days during the summer, especially on days when the temperature is 85° or higher. To plan how much ice cream to stock, she would like to know the average daily high temperature for the summer months of July and August. Assuming that daily temperatures are normally distributed, she has gathered the following data for the high temperature for 20 days from a local almanac:

86° 92°

85 94

78 83

91 81

90 84

92 76

83 78

80 78

69 85

74 90

Compute the mean and standard deviation for these data and determine the expected number of days in July and August that the high temperature will be 85° or greater.