问题 - 道道学堂问答

会计Accounting

经济Economics

金融Finance

领导力与组织管理Leadership and Organization Management

土木工程Civil Engineering

计算机类Computing

其他 All Others

The highest waterfall in the world is the Salto Angel in Venezuela. Its longest single falls has a height of 807 m. If water at the top of the falls is at 17.4°C, what is the maximum temperature of the water at the bottom of the falls? Assume all the kine

匿名用户 2021-12-01 19:32 地球与空间科学Earth and Space Science

The highest waterfall in the world is the Salto Angel in Venezuela. Its longest single falls has a height of 807 m. If w... 查看全部

2021-12-01 19:32
0
赞同
1
回答

1 a 1 ave au: Divergence: V.v== (sv) + + sas 5 дф az auz Curl: 1 , au, au V Xv= аф az Ca S+ aus az ira + (sv) as δυ, ao 2 as S If the magnetic potential A = Cs3 Ô then the current density produces this potential will be

匿名用户 2021-12-01 19:32 地球与空间科学Earth and Space Science

1 a 1 ave au: Divergence: V.v== (sv) + + sas 5 дф az auz Curl: 1 , au, au V Xv= аф az Ca S+ aus az ira + (sv) as δυ, ao ... 查看全部

2021-12-01 19:32
0
赞同
1
回答

البوابة التعليمية الإلكترو 1a 1 av au: Divergence: V.v=--(sv) + + sas s ad az Curl: VXV 1 av Buy я аф az + au, az au, au, as + IF the magnetic potential A = Cs4 then the current density produces this potential will be 8S C © NO O b. 3C Ф HO C. 3C Ф SHO O

匿名用户 2021-12-01 19:32 地球与空间科学Earth and Space Science

البوابة التعليمية الإلكترو 1a 1 av au: Divergence: V.v=--(sv) + + sas s ad az Curl: VXV 1 av Buy я аф az + au, az au, au... 查看全部

2021-12-01 19:32
0
赞同
1
回答

A wire carries an electric current directed into the page. Then the direction of the magnetic field at point P located as shown in the figure is N W .P E S L х O a d. -Y o b b. +y C. - X O d. +X

匿名用户 2021-12-01 19:32 地球与空间科学Earth and Space Science

A wire carries an electric current directed into the page. Then the direction of the magnetic field at point P located a... 查看全部

2021-12-01 19:32
0
赞同
1
回答

A combination of 0.250 kg of water at 20.0°C, 0.400 kg of aluminum at 26.0°C, and 0.100 kg of copper at 100°C is mixed in an insulated container and allowed to come to thermal equilibrium. Ignore any energy transfer to or from the container and determine

匿名用户 2021-12-01 19:32 地球与空间科学Earth and Space Science

A combination of 0.250 kg of water at 20.0°C, 0.400 kg of aluminum at 26.0°C, and 0.100 kg of copper at 100°C is mixed i... 查看全部

2021-12-01 19:32
0
赞同
1
回答

A charge is uniformly distributed over a spherical volume with radius R where p=ar2, then the the electric field outside the sphere a. ar4 380 b. aR5 3ɛor2 O c. 4aR3 3ɛor d. aR5 5ɛor2

匿名用户 2021-12-01 19:32 地球与空间科学Earth and Space Science

A charge is uniformly distributed over a spherical volume with radius R where p=ar2, then the the electric field outside... 查看全部

2021-12-01 19:32
0
赞同
1
回答

An aluminum calorimeter with a mass of 100 g contains 250 g of water. The calorimeter and water are in thermal equilibrium at 10.0°C. Two metallic blocks are placed into the water. One is a 100.0-9 piece of copper at 50.0°C. The other has a mass of 70.0 g

匿名用户 2021-12-01 19:32 地球与空间科学Earth and Space Science

An aluminum calorimeter with a mass of 100 g contains 250 g of water. The calorimeter and water are in thermal equilibri... 查看全部

2021-12-01 19:32
0
赞同
1
回答

A train at a constant 43.0 km/h moves east for 24.0 min, then in a direction 48.0° east of due north for 26.0 min, and then west for 34.0 min. What are the (a) magnitude and (b) angle (relative to east) of its average velocity during this trip? (a) Number

匿名用户 2021-12-01 19:32 地球与空间科学Earth and Space Science

A train at a constant 43.0 km/h moves east for 24.0 min, then in a direction 48.0° east of due north for 26.0 min, and t... 查看全部

2021-12-01 19:32
0
赞同
1
回答

A potential energy function for a system in which a two-dimensional force acts is of the form U=6xy-9xy Find the force that acts at the point (3,4) Note Signs are important F i 3

匿名用户 2021-12-01 19:32 地球与空间科学Earth and Space Science

A potential energy function for a system in which a two-dimensional force acts is of the form U=6xy-9xy Find the force t... 查看全部

2021-12-01 19:32
0
赞同
1
回答

A 20 kg block on a rough horizontal surface moves toward a spring of force constant k = 2000 N/m. The speed of the block at the momentit collides with the spring is 6.0 m/s. If a constant friction force of 3,8 N retards its motion, what is the speed of th

匿名用户 2021-12-01 19:32 地球与空间科学Earth and Space Science

A 20 kg block on a rough horizontal surface moves toward a spring of force constant k = 2000 N/m. The speed of the block... 查看全部

2021-12-01 19:32
0
赞同
1
回答